This recent review claimed to evaluate the evidence on the use of human and veterinary homeopathy, evidence level 1a studies were considered. Focusing on the external evidence on the use of homeopathy in infections, some evidence level 1a, 1b, 2c studies, and a case report, are described in more detail.
In conclusion, evidence for the effectiveness of human and veterinary homeopathy in general, and in particular, of homeopathic treatment for infections, is available. Especially, individualized homeopathy demonstrates effects at all quality levels according to Cochrane criteria, even in the methodologically high-quality studies. As in most areas of veterinary medicine and medicine, further good/excellent studies are necessary. In compliance with the principles of homeopathy, further methodologically high-quality trials focusing on the homeopathic treatment of infections are the next logical step. The selection of the simile (individually fitting homeopathic medicinal product) by appropriately trained homeopathic doctors/veterinarians is essential for the effectiveness of homeopathy. Implementation of studies at university facilities is a prerequisite for quality assurance. Consequently, further integration of homeopathy at universities is a necessary requirement for the patients’ best interests.
Who wrote this bizarre paper?
The authors who state to have no conflicts of interest are
This recent Cochrane review assessed the effects of so-called alternative medicine (SCAM) for post-caesarean pain. Randomised clinical trials (RCTs), including quasi-RCTs and cluster-RCTs, comparing SCAM, alone or associated with other forms of pain relief, versus other treatments or placebo or no treatment, for the treatment of post-CS pain were included.
A total of 37 studies (3076 women) investigating 8 different SCAM therapies for post-CS pain relief were found. There was substantial heterogeneity among the trials. The primary outcome measures were pain and adverse effects. Secondary outcome measures included vital signs, rescue analgesic requirement at 6 weeks after discharge; all of which were poorly reported or not reported at all.
The quality of the RCTs was low. Whether acupuncture or acupressure (versus no treatment) or acupuncture or acupressure plus analgesia (versus placebo plus analgesia) have any effect on pain. Acupuncture or acupressure plus analgesia (versus analgesia) may reduce pain at 12 hours (standardised mean difference (SMD) -0.28, 95% confidence interval (CI) -0.64 to 0.07; 130 women; 2 studies; low-certainty evidence) and 24 hours (SMD -0.63, 95% CI -0.99 to -0.26; 2 studies; 130 women; low-certainty evidence). It is uncertain whether acupuncture or acupressure (versus no treatment) or acupuncture or acupressure plus analgesia (versus analgesia) have any effect on the risk of adverse effects.
Aromatherapy plus analgesia may reduce pain when compared with placebo plus analgesia at 12 hours (mean difference (MD) -2.63 visual analogue scale (VAS), 95% CI -3.48 to -1.77; 3 studies; 360 women; low-certainty evidence) and 24 hours (MD -3.38 VAS, 95% CI -3.85 to -2.91; 1 study; 200 women; low-certainty evidence). The authors were uncertain whether aromatherapy plus analgesia has any effect on adverse effects (anxiety) compared with placebo plus analgesia.
Electromagnetic therapy may reduce pain compared with placebo plus analgesia at 12 hours (MD -8.00, 95% CI -11.65 to -4.35; 1 study; 72 women; low-certainty evidence) and 24 hours (MD -13.00 VAS, 95% CI -17.13 to -8.87; 1 study; 72 women; low-certainty evidence).
There were 6 RCTs (651 women), 5 of which were quasi-RCTs, comparing massage (foot and hand) plus analgesia versus analgesia. All the evidence relating to pain, adverse effects (anxiety), vital signs and rescue analgesic requirement was very low-certainty.
Music therapy plus analgesia may reduce pain when compared with placebo plus analgesia at one hour (SMD -0.84, 95% CI -1.23 to -0.46; participants = 115; studies = 2; I2 = 0%; low-certainty evidence), 24 hours (MD -1.79, 95% CI -2.67 to -0.91; 1 study; 38 women; low-certainty evidence), and also when compared with analgesia at one hour (MD -2.11, 95% CI -3.11 to -1.10; 1 study; 38 women; low-certainty evidence) and at 24 hours (MD -2.69, 95% CI -3.67 to -1.70; 1 study; 38 women; low-certainty evidence). It is uncertain whether music therapy plus analgesia has any effect on adverse effects (anxiety), when compared with placebo plus analgesia because the quality of evidence is very low.
The investigators were uncertain whether Reiki plus analgesia compared with analgesia alone has any effect on pain, adverse effects, vital signs or rescue analgesic requirement because the quality of evidence is very low (one study, 90 women). Relaxation Relaxation may reduce pain compared with standard care at 24 hours (MD -0.53 VAS, 95% CI -1.05 to -0.01; 1 study; 60 women; low-certainty evidence).
Transcutaneous electrical nerve stimulation (TENS)
TENS (versus no treatment) may reduce pain at one hour (MD -2.26, 95% CI -3.35 to -1.17; 1 study; 40 women; low-certainty evidence). TENS plus analgesia (versus placebo plus analgesia) may reduce pain compared with placebo plus analgesia at one hour (SMD -1.10 VAS, 95% CI -1.37 to -0.82; 3 studies; 238 women; low-certainty evidence) and at 24 hours (MD -0.70 VAS, 95% CI -0.87 to -0.53; 108 women; 1 study; low-certainty evidence). TENS plus analgesia (versus placebo plus analgesia) may reduce heart rate (MD -7.00 bpm, 95% CI -7.63 to -6.37; 108 women; 1 study; low-certainty evidence) and respiratory rate (MD -1.10 brpm, 95% CI -1.26 to -0.94; 108 women; 1 study; low-certainty evidence). The authors were uncertain whether TENS plus analgesia (versus analgesia) has any effect on pain at six hours or 24 hours, or vital signs because the quality of evidence is very low (two studies, 92 women).
The authors concluded that some SCAM therapies may help reduce post-CS pain for up to 24 hours. The evidence on adverse events is too uncertain to make any judgements on safety and we have no evidence about the longer-term effects on pain. Since pain control is the most relevant outcome for post-CS women and their clinicians, it is important that future studies of SCAM for post-CS pain measure pain as a primary outcome, preferably as the proportion of participants with at least moderate (30%) or substantial (50%) pain relief. Measuring pain as a dichotomous variable would improve the certainty of evidence and it is easy to understand for non-specialists. Future trials also need to be large enough to detect effects on clinical outcomes; measure other important outcomes as listed in this review, and use validated scales.
I feel that the Cochrane Collaboration does itself no favours by publishing such poor reviews. This one is both poorly conceived and badly reported. In fact, I see little reason to deal with pain after CS differently than with post-operative pain in general. Some of the modalities discussed are not truly SCAM. Most of the secondary endpoints are irrelevant. The inclusion of adverse effects as a primary endpoint seems nonsensical considering that SCAM studies are notoriously bad at reporting them. Many of the allegedly positive findings rely on trial designs that cannot control for placebo effects (e.g A+B versus B); therefore they tell us nothing about the effectiveness of the therapy.
Most importantly, the conclusions are not helpful. I would have simply stated that none of the SCAM modalities are supported by convincing evidence as treatments for pain control after CS.
Prof. Shailendra Ramchandra Vishampayan is the 1st author of the paper we discussed yesterday. He was kind enough to repeatedly join us in the comments section, and I was therefore keen to learn more about him. On his website, he says about himself that he is a renowned academician and famous homeopath, enriched with decades of ideal experiences and quality services. He is registered medical practitioner (M.D), performs all the duties of registered medical practitioner following the law of land in India. Globally he is considered as homeopath and known as “Dr.V”. He is a registered member of Society of Homeopaths (overseas).
Dr. V, is a practicing homeopath with clinical experience of over 20 years. In course of his years of practice he had successfully helped more than 250 happy families globally, with various kinds of cases like thyroid, immune compromised, epilepsy, endocrine disorders, paediatric, gynaecological disorders addictions, psychiatric disorder, children with special needs, pets and plants.
He is famous for his path breaking concept and novel idea of creating an organization called ‘Folk Homeopathy ‘, which is dedicated to professional enrichment of homeopathic practitioners helping them to improve their clinical acumen with spot on prescription.
His practical approach in solving cases has earned him accolades and fame throughout the globe.
Dr. V is the author of ‘Kinder Garten Materia Medica’ a reference book for beginners widely used by homeopathic students in India. It is a book with unique combination of pictorial and pneumonic.
He is a Professor (PG) at D.Y.Patil Homeopathy Medical College (Pune). He has a teaching experience of over 16 years in teaching UG and PG. He has drawn large number of followers through webinars which is accessible throughout the globe. He has given more than 50 international seminar ,workshops and webinars in countries like USA, Ireland, Malaysia, with presentations on Homeopathic approach to female hormonal imbalance cases at OMICS Conference of Alternative Medicine, presentation on Psychiatric cases at Asian Homeopathic League. And various presentation at University of Cyberjaya, Malaysia, California Homeopathic Medical society, San Diego and also at Corte Madera, 98th FOH Congress, Liverpool and Kinvara Co Galway, Ireland.
And on the same site, we also learn that ‘Dr V’ is particularly adept at treating diabetes:
India is now considered as the diabetes capital of the world. Approximately 8.7 percent of Indians between the age of 20 to 70 years are diabetic. This translates to approximately 62.5 million diabetics living in India, according to estimates by the World Health Organisation (W.H.O.) The economic burden of managing this disease is also substantial since this is a combination of cost of treatment and loss of productivity in such a high number of diabetics. Diabetes can affect multiple organ systems resulting in a wide range of serious issues in patients. Many of these complications in a diabetic do not have any specific treatment with conventional medicines. However, an indication of the popularity of homeopathy amongst diabetics is that the doctors at our clinic treat approximately two hundred cases of diabetes or diabetes related issues every day. We have, in fact, developed specific diabetes management protocols for patients based on the experience of thousands of cases we have seen over four decades.
This is interesting, I thought, and conducted a few Medline searches to see whether there is any evidence to show that homeopathy is an effective therapy for diabetes. I am afraid, I found no papers of ‘Dr V’ to suggest such an effect. But what I did find was certainly fascinating.
Last year, Italian diabetologists published an review entitled ‘Alternative treatment or alternative to treatment? A systematic review of randomized trials on homeopathic preparations for diabetes and obesity‘. Here is what they reported:
The searches failed to retrieve any trial comparing homeopathic remedies with placebo or any active drug for the treatment of either diabetes or obesity.
These authors commented that
… if homeopathy is used as an alternative to available and effective treatments, the consequences can be catastrophic, particularly in some conditions such as insulin-requiring diabetes. In conclusion, there is no scientific evidence on efficacy and no demonstration of safety of homeopathy in diabetes and obesity…
‘Dr V’ will probably point out that he is a fully qualified doctor and uses homeopathy merely as an adjunct to conventional anti-diabetic treatments; thus he kills nobody.
I certainly hope this is so! But, even in this case, I must still ask: WHERE IS THE EVIDENCE THAT HOMEOPATHY IS AN EFFECTIVE ADJUNCT TO CONVENTIONAL MEDICINE?
Guest post by Ken McLeod
‘Ayurvedic Medicine,’ or Ayurveda, is an alternative medicine system which originated in India as long as 5,000 years ago, according to its proponents. Science-based medicine refers to it as pseudoscientific and the Indian Medical Association (IMA) characterises it as quackery.  Ayurvedic practitioners claim that its popularity through the ages vindicates it as safe and effective.
That last bit is of course the appeal to antiquity, or the appeal to tradition (also known as argumentum ad antiquitatem.  This proposes that if something was supported by people for a long time it must be valid. That is bunkum; many ancient ideas have long since been discredited; the Earth is not flat, no matter for how long people thought it was.
Nevertheless, ‘Ayurvedic Medicine’ has many practitioners and supporters in the supposedly rational West, including Bondi Junction here in Australia. Despite the many warnings about it,  people still go to practitioners, and occasionally they are injured.
One such injury and the consequent complaint to the New South Wales regulator, the Health Care Complaints Commission, (HCCC), has resulted in a Public Warning dated 18 September concerning levels of heavy metals in Ayurvedic Medication. 
The HCCC said:
‘The NSW Health Care Complaints Commission is concerned about a complaint received regarding the prescription of “Manasamithra Vatika,” (Manasamitram Pills) an Ayurvedic medication.
‘The complaint related to prescription of this medication to a child for treatment of autism.
‘This medication was found to contain concerning levels of lead and other heavy metals.’
That’s all very bland, no headlines there. But then it got into:
“The Commission strongly urges those individuals seeking alternative therapies to be vigilant in their research prior to proceeding with any natural therapy medications or medicines and to discuss any such proposed therapies with their treating registered health practitioner.”
Not so bland there; that’s very comprehensive; ‘any natural therapy medications or medicines’ and ‘discuss any such proposed therapies with their treating registered health practitioner.” ‘Note the HCCC’s emphasis on “registered.” That rules out Ayurvedic Medicine practitioners, homeopaths, and other assorted cranks; go to a real doctor.
Surely that is headline material; a regulator responsible for promoting the health of citizens warns them to go to real doctors before going to these quacks.
Then it gets better, (or worse if you are an Ayurvedic Medicine practitioner). At the same time the HCCC issued an Interim Prohibition Order against Mr Rama Prasad (“Ayurveda Doctor Rama Prasad.”)  The HCCC’s Order says:
‘The NSW Health Care Complaints Commission (“the Commission”) is currently investigating Mr Rama Prasad in relation to his prescribing of the Ayurvedic Medication “Manasamithra Vatika” (Manasamitram Pills) to both children and adults and about his claims that his treatments can reverse several aspects of autism in children.
‘The Ayurvedic Medication “Manasmithra Vatika” (Manasamitram Pills) was found to contain elevated levels of lead and other heavy metals.
‘One case with mildly elevated blood level was notified to the South Eastern Sydney Public Health Unit after consuming this product.
‘Clients residing in NSW who are considered to have been placed at possible risk have now been contacted by NSW Health public health personnel.
‘The Commission has issued an interim prohibition order in relation to Mr Rama Prasad, under section 41AA of the Health Care Complaints Act 1993 (‘The Act’). Mr Prasad is currently prohibited from providing any health services, either in paid employment or voluntarily, to any member of the public.
‘This interim prohibition order will remain in force for a period of eight weeks and may be renewed where appropriate in order to protect the health or safety of the public.’
That should send chills down the spine of any Ayurvedic Medicine practitioner. A complete Prohibition Order ordering Prasad not to engage in providing any health service as defined in the Act  for eight weeks, which may be renewed or even made permanent, depending on what the investigation finds. The Act includes a comprehensive list of activities that comprise a ‘health service’:
‘health service includes the following services, whether provided as public or private services:
- (a) medical, hospital, nursing and midwifery services,
- (b) dental services,
- (c) mental health services,
- (d) pharmaceutical services,
- (e) ambulance services,
- (f) community health services,
- (g) health education services,
- (h) welfare services necessary to implement any services referred to in paragraphs (a)–(g),
- (i) services provided in connection with Aboriginal and Torres Strait Islander health practices and medical radiation practices,
- (j) Chinese medicine, chiropractic, occupational therapy, optometry, osteopathy, physiotherapy, podiatry and psychology services,
- (j1) optical dispensing, dietitian, massage therapy, naturopathy, acupuncture, speech therapy, audiology and audiometry services,
- (k) services provided in other alternative health care fields,
- (k1) forensic pathology services,’
Note the inclusion of ‘health education.’ This is where so many cranks fall foul of the law; setting yourself up as a health educator makes you subject to the Act. Even if you claim to be a master chef, homeopath or Ayurvedic Medicine Practitioner, you are not exempt.
It’s early days yet in this particular saga, and there are many questions to be answered, for example:
- – How did this “medicine” get past Australia’s Therapeutic Goods Administration, (Australia’s equivalent to the US FDA)?
- – Did the TGA list or register it?
- – If not why not? If it was who is responsible?
- – Was this detected only after a child was so sickened that they were taken to hospital?
- – Why is the practitioner concerned still advertising his Ayurvedic medicine courses?  Is this a breach of his Prohibition Order which prohibits ‘health education services’?’
So stay tuned for updates as this case progresses. In the meantime note that an Australian Health regulator is advising the public to seek advice from real doctors before going to alternative therapists, including ‘Ayurvedic Medicine’ practitioners. That is a real headline.
 Such as from the Victoria Dept of Health at https://www.betterhealth.vic.gov.au/health/conditionsandtreatments/ayurveda
 Health Care Complaints Act 1993 https://www.legislation.nsw.gov.au/view/html/inforce/current/act-1993-105
‘Infodemics’ are outbreaks of false information including rumours, stigma, and conspiracy theories. All of these have been common during the COVID-19 pandemic. The detection, assessment, and response to rumours, stigma, and conspiracy theories in real time are a challenge.
An international team of researchers followed and examined COVID-19-related rumours, stigma, and conspiracy theories circulating on online platforms, including fact-checking agency websites, Facebook, Twitter, and online newspapers, and their impacts on public health. Information was extracted between December 31, 2019 and April 5, 2020, and descriptively analysed. The team performed a content analysis of the news articles to compare and contrast data collected from other sources.
The researchers identified 2,311 reports of rumours, stigma, and conspiracy theories in 25 languages from 87 countries. Claims were related to:
- illness, transmission and mortality (24%),
- control measures (21%),
- treatment and cure (19%),
- cause of disease including the origin (15%),
- violence (1%),
- and miscellaneous (20%).
Of the 2,276 reports for which text ratings were available, 1,856 claims were false (82%).
The authors concluded that misinformation fuelled by rumours, stigma, and conspiracy theories can have potentially serious implications on the individual and community if prioritized over evidence-based guidelines. Health agencies must track misinformation associated with the COVID-19 in real time, and engage local communities and government stakeholders to debunk misinformation.
These findings are as perplexing as they are frightening. On this blog, we have since the beginning of the pandemic focussed on the SCAM for COVID-19. We have seen that this health crisis provided an occasion for almost any quackery on the planet:
- supplement salesmen,
- essential oil salesmen.
They all crept out of the woodwork. Their methods may differ, but their aim seems to be the same: to make a fast buck regardless of how many people their activities might kill.
You have probably guessed it: I am not a fan of Donald Trump (he made several previous appearances on this blog, see here, here here and here). There are many things that I dislike about him, and his attitude towards vaccination is but one of them. Researchers from Australia and from my own University (!) have conducted two studies on this subject which I find extraordinary and important. Here is their abstract:
Donald Trump is the first U.S. President to be on the record as having anti-vaccination attitudes. Given his enormous reach and influence, it is worthwhile examining the extent to which allegiance to Trump is associated with the public’s perceptions of vaccine safety and efficacy. In both Study 1 (N = 518) and Study 2 (N = 316), Trump voters were significantly more concerned about vaccines than other Americans. This tendency was reduced to non-significance after controlling for conspiracist ideation (i.e., general willingness to believe conspiracy theories) and, to a lesser degree, political conservatism. In Study 2, participants were later exposed to real Trump tweets that either focused on his anti-vaccination views, or focused on golf (the control condition). Compared to when the same respondents were sampled a week earlier, there was a significant increase in vaccine concern, but only among Trump voters who were exposed to the anti-vaccination tweets. The effects were exclusively negative: there was no evidence that anti-vaccination Trump tweets polarized liberal voters into becoming more pro-vaccination. In line with the social identity model of leadership, Study 2 indicates that some leaders do not simply represent the attitudes and opinions of the group, but can also change group members’ opinions.
I find this paper so important and excellent that I take the liberty of quoting from the authors’ discussion:
Both studies showed that people who voted for Trump in the 2016 Presidential election were more concerned about vaccines than other voters. When it came to general concern about vaccines, this “Trump effect” was entirely accounted for by the fact that Trump voters are not only more politically conservative than other Americans but also (and independently) more predisposed to believe conspiracy theories. In fact, the tendency for Trump voters to have greater concerns about the MMR vaccine in particular was not explained so much by their political conservatism as it was by their conspiracist ideation.
Study 1 illustrates that Trump voters are particularly prone to anti-vaccination attitudes. Study 2 further demonstrates that these attitudes are not static: it shows that a revered, prototypical ingroup member can actively exacerbate this propensity to endorse factually unfounded beliefs.
One overarching debate about the influence of political leaders is the extent to which they shape supporters’ views, or merely reflect them. Study 2 makes clear that the “Trump effect” is not merely a case of Trump holding a mirror to people’s pre-existing views: his messages have the power to change attitudes. As such, future research needs to
take seriously the impact of Trump as a change-agent, one that is impeding the broader campaign to increase vaccination uptake and to eliminate infectious diseases.
So, the ‘Trump-Effect’ on vaccination attitudes is strongly negative. This leads me to suspect that the ‘Trump-Effect’ on many other issues is just as profoundly detrimental. For the sake not just of public health, let us hope that the US public will dismiss their dangerous president when they go to the ballot in just a few weeks time.
On this blog, I have discussed the adverse events (AEs) of spinal manipulative therapy (SMT) with some regularity, and we have seen that ~ 50% of patients who receive SMT from a chiropractor experience some kind of AE. In addition there are many serious complications. In my book, I discuss, apart from the better-known vascular accidents followed by a stroke or death, the following:
- atlantoaxial dislocation,
- cauda equina syndrome,
- cervical radiculopathy,
- diaphragmatic paralysis,
- disrupted fracture healing,
- dural sleeve injury,
- haemorrhagic cysts,
- muscle abscess,
- muscle abscess,
- neurologic compromise,
- oesophageal rupture
- soft tissue trauma,
- spinal cord injury,
- vertebral disc herniation,
- vertebral fracture,
- central retinal artery occlusion,
- Wallenberg syndrome,
- loss of vision,
- Horner’s syndrome.
Considering this long list, we currently have far too little reliable information. A recent publication offers further information on this important topic.
The aim of this study was to identify beliefs, perceptions and practices of chiropractors and patients regarding benign AEs post-SMT and potential strategies to mitigate them. Clinicians and patients from two chiropractic teaching clinics were invited to respond to an 11-question survey exploring their beliefs, perceptions and practices regarding benign AEs post-SMT and strategies to mitigate them.
A total of 39 clinicians (67% response rate) and 203 patients (82.9% response rate) completed the survey. The results show that:
- 97% of the chiropractors believed benign AEs occur.
- 82% reported their own patients have experienced an AE.
- 55% of the patients reported experiencing benign AEs post-SMT, with the most common symptoms being pain/soreness, headache and stiffness.
- 61.5% of the chiropractors reported trying a mitigation strategy with their patients.
- Yet only 21.2% of patients perceived their clinicians had tried any mitigation strategy.
- Chiropractors perceived that patient education is most likely to mitigate benign AEs, followed by soft tissue therapy and/or icing after SMT.
- Patients perceived stretching was most likely to mitigate benign AEs, followed by education and/or massage
The authors concluded that this is the first study comparing beliefs, perceptions and practices from clinicians and patients regarding benign AEs post-SMT and strategies to mitigate them. This study provides an important step towards identifying the best strategies to improve patient safety and improve quality of care.
The question that I have often asked before, and I am bound to ask again after seeing such results, is this:
If there were a drug that causes temporary pain/soreness, headache and stiffness in 55% of all patients (plus an unknown frequency of a long list of serious complications), while being of uncertain benefit, do you think it would still be on the market?
Dr Mathias Rath, the German born purveyor of multiple food supplements, and his organisation puzzle me a great deal. As previously reported, the ‘Dr Rath Foundation’ published an article about me. In it, the author got my name right, but not much more. Here is its opening passage [the numbers in square brackets refer to my comments below].
Professor Edzard Ernst: A Career Built On Discrediting Natural Health Science? 
Professor Edzard Ernst, a retired German  physician and academic, has recently  become a prominent advocate of plans that could potentially outlaw  the entire profession of naturopathic doctors  in Germany. Promoting the nonsensical idea that naturopathic medicine somehow poses a risk to public health, Ernst attacks its practitioners as supposedly having been educated in “nonsense” . Tellingly, however, given that he himself has seemingly not published even so much as one completely original scientific trial of his own , Ernst’s apparent attempts to discredit natural healthcare approaches are largely reliant instead on his analysis or review of handpicked negative studies carried out by others .
- When I was appointed at Exeter to research alternative medicine in 1993, I had already been a full professor at Hannover, Germany and subsequently at Vienna, Austria. If anything, coming to Exeter was a big step down in terms of ‘career’, salary, number of co-workers etc. (full details in my memoir)
- I am German-born, became an Austrian citizen in 1990, and since 2000 I am a British national.
- I have been critical about the German ‘Heilpraktiker’ for more than 20 years.
- This refers to the recent ‘Muensteraner Memorandum’ which is the work of an entire team of multidisciplinary experts and advocates reforming this profession.
- ‘Heilpraktiker’ are certainly not doctors; they have no academic or medical background.
- This is correct, and I stand by my statement that educating people in vitalism and other long-obsolete concepts is pure nonsense.
- Since I am researching alternative medicine, I have conducted and published about 40 ‘scientific trials’, and before that time (1993) I have published about the same number again in various other fields.
- This refers to systematic reviews which, by definition, include all the studies available on a defines research question, regardless of their conclusion (their aim is to minimise random and selection biases) .
Rath states about himself that “Dr. Rath heads a research and development institute in nutritional and Cellular Medicine. His institute is conducting basic research and clinical studies to scientifically document the health benefits of micronutrients in fighting a multitude of diseases.”
But this is equally puzzling.
Firstly, because research does not aim ‘to scientifically document the health benefits of ‘ anything; it is for testing hypotheses; Rath surely must know that. Secondly, on Medline, I find dozens of publications by Rath. These refer mostly to mechanistic in-vitro or animal studies about the mode of action of vitamins and other natural compounds.
But ‘clinical studies‘?
Hold on! My Medline searches did deliver one clinical trial – just one – (Rath himself lists more, but they seem to be meaningless observational studies without a control group). It was published as an abstract on his own website. Here is the abstract:
Healing of bone fractures is a prolonged process that can be affected by nutrition. Our objective was to critically evaluate the effect of supplementation with an essential nutrient complex, containing ascorbic acid, lysine, proline, and vitamin B6 on healing time of tibial fractures.
Random double-blind placebo-controlled study
Dr. Jamdar Hospital, Jabalpur, India
Subjects and Intervention:
113 patients with unilateral displaced closed or grade I open tibial fractures were randomized to receive either standard care with placebo or with supplementation with an essential nutrient complex containing ascorbic acid, lysine, proline, and vitamin B6. Qualifying patients, on admission to the study, were clinically examined, radiographs of the affected limbs taken, fractures reduced under anesthesia, and above knee plaster casts applied. Radiographs were taken at each follow-up visit to confirm reduced alignment of fracture and proper callus formation.
Primary Outcome Measure:
The primary outcome measure was the number of weeks required for fracture to be healed. Healing was defined as absence of abnormal mobility at fracture site clinically, absence of pain elicited by stressing the fracture or by walking, and radiographic confirmation of callus formation.
Data analysis demonstrated reduced fracture-healing time associated with experimental supplementation. For PP analysis group, fracture healing time in 75% of the supplemented group of patients (N=21) was 17 weeks or less and 19 weeks or less in 75% of the placebo group patients (N=36). The percentage of patients with fractures healing in 10 weeks or less was 33.3% for the supplemented group and 11.1% for the placebo group. However, the difference in healing time between the two groups did not reach statistical significance.
Results showed encouraging trends that fracture-healing time is reduced by supplementation with an essential nutrient complex containing ascorbic acid, lysine, proline, and vitamin B6. In addition, the nutrient supplemented participants reported improved feeling of well-being with use of the supplement.
This is odd in several ways:
- Even though the conclusions hide it quite well, the trial was in fact negative, i. e. it failed to show a significant difference between the verum and the placebo in the primary outcome measure.
- The trial was never published as a peer-reviewed full paper. The website refers to its publication as a ‘letter to the editor’ (LTTE) in the notorious JACM (a LTTE is not normally peer-reviewed).
- Why was it never properly published?
- Could it be because there was no ethics approval [none was mentioned in the LTTE]?
- Could it be because there was no informed consent [none was mentioned in the LTTE]?
- The LTTE mentions that a larger study with 200 patients is planned. This was 16 years ago, and to date there is no trace of such a trial.
Rath’s latest contribution to the world of science is a paper implying that his supplements could play a role in the fight against the present pandemic; it is entitled ‘Effective and safe global public health strategy to fight the COVID-19 pandemic: Specific micronutrient composition inhibits Coronavirus cell-entry receptor (ACE2) expression’. Here is the abstract which clearly shows that Rath has not a jot of clinical evidence:
Optimum micronutrient intake is the only scientifically proven way to improve general immune resistance against infections, a fact documented in every leading textbook of biology. This study provides scientific evidence that, in addition, specific micronutrient compositions are powerful tools in the fight against the COVID-19 pandemic.
Both, SARS-CoV-2 – the virus that causes the current pandemic – and other coronaviruses enter body cells via a specific receptor, the Angiotensin-Converting-Enzyme 2 (ACE2). The ACE2 receptor is expressed by many cell types, including lung epithelial cells as well as endothelial cells of the vascular system.
Based on our earlier research that demonstrated that specific micronutrients can block several mechanisms of viral infections, we tested the efficacy of these natural compounds in suppressing the expression of the ACE2 receptor on human endothelial cells and small airway epithelial cells.
Our results show that a micronutrient composition comprising vitamin C as well as certain amino acids, polyphenols, and trace elements is able to suppress this viral ‘entry door’ into the body under both normal and inflammatory conditions, which are associated with infections.
Thus, vitamin-rich nutrition and micronutrient supplementation should be implemented as effective, safe and affordable public health strategies to fight the COVID-19 pandemic and help prevent future outbreaks. Optimizing the micronutrient status of the entire population should form the basis for any global strategy to help prevent future pandemics across the world, including the developing nations.
The Wiki-page on Rath lists 10 (!) legal cases in which he has been involved. This looks like he easily sues people who disagree with his often bizarre views and sales techniques. Considering this suspicion, I better be careful what I say here. Therefore let me conclude by meekly repeating the title of this post which comes from my friend Ben Goldacre who, together with THE GUARDIAN won a famous and expensive legal battle against Rath:
Rath is an example of the worst excesses of the alternative therapy industry.
What I like best about the many supplements sold by Rath is the footnote in the patient leaflets:
THIS PRODUCT IS NOT INTENDED TO DIAGNOSE, TREAT, CURE OR PREVENT ANY DISEASE
My new book has just been published. Allow me to try and whet your appetite by showing you the book’s introduction:
“There is no alternative medicine. There is only scientifically proven, evidence-based medicine supported by solid data or unproven medicine, for which scientific evidence is lacking.” These words of Fontanarosa and Lundberg were published 22 years ago. Today, they are as relevant as ever, particularly to the type of healthcare I often call ‘so-called alternative medicine’ (SCAM), and they certainly are relevant to chiropractic.
Invented more than 120 years ago by the magnetic healer DD Palmer, chiropractic has had a colourful history. It has now grown into one of the most popular of all SCAMs. Its general acceptance might give the impression that chiropractic, the art of adjusting by hand all subluxations of the three hundred articulations of the human skeletal frame, is solidly based on evidence. It is therefore easy to forget that a plethora of fundamental questions about chiropractic remain unanswered.
I wrote this book because I feel that the amount of misinformation on chiropractic is scandalous and demands a critical evaluation of the evidence. The book deals with many questions that consumers often ask:
- How well-established is chiropractic?
- What treatments do chiropractors use?
- What conditions do they treat?
- What claims do they make?
- Are their assumptions reasonable?
- Are chiropractic spinal manipulations effective?
- Are these manipulations safe?
- Do chiropractors behave professionally and ethically?
Am I up to this task, and can you trust my assessments? These are justified questions; let me try to answer them by giving you a brief summary of my professional background.
I grew up in Germany where SCAM is hugely popular. I studied medicine and, as a young doctor, was enthusiastic about SCAM. After several years in basic research, I returned to clinical medicine, became professor of rehabilitation medicine first in Hanover, Germany, and then in Vienna, Austria. In 1993, I was appointed as Chair in Complementary Medicine at the University of Exeter. In this capacity, I built up a multidisciplinary team of scientists conducting research into all sorts of SCAM with one focus on chiropractic. I retired in 2012 and am now an emeritus professor. I have published many peer-reviewed articles on the subject, and I have no conflicts of interest. If my long career has taught me anything, it is this: in the best interest of consumers and patients, we must insist on sound evidence; not opinion, not wishful thinking; evidence.
In critically assessing the issues related to chiropractic, I am guided by the most reliable and up-to-date scientific evidence. The conclusions I reach often suggest that chiropractic is not what it is often cracked up to be. Hundreds of books have been published that disagree. If you are in doubt who to trust, the promoter or the critic of chiropractic, I suggest you ask yourself a simple question: who is more likely to provide impartial information, the chiropractor who makes a living by his trade, or the academic who has researched the subject for the last 30 years?
This book offers an easy to understand, concise and dependable evaluation of chiropractic. It enables you to make up your own mind. I want you to take therapeutic decisions that are reasonable and based on solid evidence. My book should empower you to do just that.
About one in three individuals have elevated blood pressure. This is bad news because hypertension is one of the most important risk factors for cardiovascular events like strokes and heart attacks. Luckily, there are many highly effective approaches for treating elevated blood pressure (diet, life-style, medication, etc.), and the drug management of hypertension has improved over the last few decades.
But unfortunately all anti-hypertensive drugs have side-effects and some patients look towards so-called alternative medicine (SCAM) to normalise their blood pressure. Therefore, we have to ask: are SCAMs effective treatments for hypertension? Because of the prevalence of hypertension, this is a question of great importance for public health.
In 2005, I addressed the issue by publishing a review entitled ‘Complementary/alternative medicine for hypertension: a mini-review‘. Here is its abstract:
Many hypertensive patients try complementary/alternative medicine for blood pressure control. Based on extensive electronic literature searches, the evidence from clinical trials is summarised. Numerous herbal remedies, non-herbal remedies and other approaches have been tested and some seem to have antihypertensive effects. The effect size is usually modest, and independent replications are frequently missing. The most encouraging data pertain to garlic, autogenic training, biofeedback and yoga. More research is required before firm recommendations can be offered.
Since the publication of this paper, more systematic reviews have become available. In order to get an overview of this evidence, I conducted a few simple Medline searches for systematic reviews (SRs) of SCAM published between 2005 and today. I included only SRs that were focussed on just one specific therapy as a treatment of just one specific condition, namely hypertension (omitting SRs with titles such as ‘Alternative treatments for cardiovascular conditions’). Reviews on prevention were also excluded. Here is what I found (the conclusions of each SR is quoted verbatim):
- A 2020 SR of auricular acupressure including 18 RCTs: The results demonstrated a favorable effect of auricular acupressure to reduce blood pressure and improve sleep in patients with hypertension and insomnia. Further studies to better understand the acupoints and intervention times of auricular acupressure are warranted.
- A 2020 SR of Chinese herbal medicines (CHM) including 30 studies: CHM combined with conventional Western medicine may be effective in lowering blood pressure and improving vascular endothelial function in patients with hypertension.
- A 2020 SR of Tai chi including 28 RCTs: Tai Chi could be recommended as an adjuvant treatment for hypertension, especially for patients less than 50 years old.
- A 2020 SR of Tai chi including 13 trials: Tai chi is an effective physical exercise in treating essential hypertension compared with control interventions.
- A 2020 SR of Tai chi including 31 controlled clinical trials: Tai Ji Quan is a viable antihypertensive lifestyle therapy that produces clinically meaningful BP reductions (i.e., 10.4 mmHg and 4.0 mmHg of SBP and DBP reductions, respectively) among individuals with hypertension.
- A 2020 SR of pycnogenol including 7 trials: the present meta-analysis does not suggest any significant effect of pycnogenol on BP.
- A 2019 SR of Policosanol including 19 studies: Policosanol could lower SBP and DBP significantly; future long term studies are required to confirm these findings in the general population.
- A 2019 SR of dietary phosphorus including 14 studies: We found no consistent association between total dietary phosphorus intake and BP in adults in the published literature nor any randomized trials designed to examine this association.
- A 2019 SR of ginger including 6 RCTs: ginger supplementation has favorable effects on BP.
- A 2019 SR of corn silk tea (CST) including 5 RCTs: limited evidence showed that CST plus antihypertensive drugs might be more effective in lowering blood pressure compared with antihypertensive drugs alone.
- A 2019 SR of blood letting including 7 RCTs: no definite conclusions regarding the efficacy and safety of BLT as complementary and alternative approach for treatment of hypertension could be drew due to the generally poor methodological design, significant heterogeneity, and insufficient clinical data.
- A 2019 SR of Xiao Yao San (XYS) including 17 trials: XYS adjuvant to antihypertensive drugs maybe beneficial for hypertensive patients in lowering BP, improving depression, regulating blood lipids, and inhibiting inflammation.
- A 2019 SR of Chinese herbal medicines including 9 RCTs: Chinese herbal medicine as complementary therapy maybe beneficial for postmenopausal hypertension.
- A 2019 Cochrane review of guided imagery including 2 trials: There is insufficient evidence to inform practice about the use of guided imagery for hypertension in pregnancy.
- A 2019 Cochrane review of acupuncture including 22 RCTs: At present, there is no evidence for the sustained BP lowering effect of acupuncture that is required for the management of chronically elevated BP.
- A 2019 SR of wet cupping including 7 RCTs: no firm conclusions can be drawn and no clinical recommendations made.
- A 2019 SR of transcendental meditation (TM) including 9 studies: TM was associated with within-group (but not between-groups) improvements in BP.
- A 2019 SR of yoga including 49 trials: yoga is a viable antihypertensive lifestyle therapy that produces the greatest BP benefits when breathing techniques and meditation/mental relaxation are included.
- A 2018 SR of mindfulness-based stress reduction (MBSR) including 5 studies: The MBSR program is a promising behavioral complementary therapy to help people with hypertension lower their blood pressure
- A 2018 SR of beetroot juice (BRJ) including 11 studies: BRJ supplementation should be promoted as a key component of a healthy lifestyle to control blood pressure in healthy and hypertensive individuals.
- A 2018 SR of taurine including 7 studies: ingestion of taurine at the stated doses and supplementation periods can reduce blood pressure to a clinically relevant magnitude, without any adverse side effects.
- A 2018 SR of acupuncture including 30 RCTs: there is inadequate high quality evidence that acupuncture therapy is useful in treating hypertension.
- A 2018 SR of co-enzyme Q10 including 17 RCTs: CoQ10 supplementation may result in reduction in SBP levels, but did not affect DBP levels among patients with metabolic diseases.
- A 2018 SR of a traditional Chinese formula Longdanxiegan decoction (LDXGD) including 9 trials: Due to poor methodological quality of the included trials, as well as potential reporting bias, our review found no conclusive evidence for the effectiveness of LDXGD in treating hypertension.
- A 2018 SR of viscous fibre including 22 RCTs: Viscous soluble fiber has an overall lowering effect on SBP and DBP.
- A 2017 SR of yoga breathing exercise (pranayama) including 13 studies: The pranayama’s effect on BP were not robust against selection bias due to the low quality of studies. But, the lowering BP effect of pranayama is encouraging.
- A 2017 SR of dietary nitrate supplementation including 13 trials: Positive effects of medium-term dietary nitrate supplementation on BP were only observed in clinical settings, which were not corroborated by more accurate methods such as 24-h ambulatory and daily home monitorings.
- A 2017 SR of Vitamin D supplementation including 8 RCTs: vitamin D is not an antihypertensive agent although it has a moderate SBP lowering effect.
- A 2017 SR of pomegranate including 8 RCTs: The limited evidence from clinical trials to date fails to convincingly show a beneficial effect of pomegranate on blood pressure
- A 2017 SR of ‘forest bathing’ including 20 trials: This systematic review shows a significant effect of Shinrin-yoku on reduction of blood pressure.
- A 2017 SR of Niuhuang Jiangya Preparation (NHJYP) including 12 RCTs: Our review indicated that NHJYP has some beneficial effects in EH patients with liver-yang hyperactivity and abundant phlegm-heat syndrome.
- A 2017 SR of Chinese medicines (CM) including 24 studies: CM might be a promising approach for the elderly with isolated systolic hypertension, while the evidence for CM employed alone was insufficient.
- A 2017 SR of beetroot juice including 22 RCTs: Our results demonstrate the blood pressure-lowering effects of beetroot juice and highlight its potential NO3-independent effects.
- A 2017 SR of blueberry including 6 RCTs: the results from this meta-analysis do not favor any clinical efficacy of blueberry supplementation in improving BP
- A 2016 Cochrane review of co-enzyme Q10 including 3 RCTs: This review provides moderate-quality evidence that coenzyme Q10 does not have a clinically significant effect on blood pressure.
- A 2016 SR of Nigella sativa including 11 RCTs: short-term treatment with N. sativa powder can significantly reduce SBP and DBP levels.
- A 2016 SR of vitamin D3 supplementation including 30 RCTs: Supplementation may be beneficial at daily doses >800 IU/day for <6 months in subjects ≥50 years old.
- A 2016 SR of anthocyanin supplementation including 6 studies: results from this meta-analysis do not favor any clinical efficacy of supplementation with anthocyanins in improving blood pressure.
- A 2016 SR of flaxseed including 15 trials: This meta-analysis of RCTs showed significant reductions in both SBP and DBP following supplementation with various flaxseed products.
- A 2016 SR of massage therapy including 9 RCTs: This systematic review found a medium effect of massage on SBP and a small effect on DBP in patients with hypertension or prehypertension.
- A 2015 SR of massage therapy including 24 studies: There is some encouraging evidence of massage for essential hypertension.
- A 2015 SR of transcendental meditation (TM) including 12 studies: an approximate reduction of systolic and diastolic BP of -4.26 mm Hg (95% CI=-6.06, -2.23) and -2.33 mm Hg (95% CI=-3.70, -0.97), respectively, in TM groups compared with control groups.
- A 2015 SR of Zhen Wu Decoction (ZWD) including 7 trials: This systematic review revealed no definite conclusion about the application of ZWD for hypertension due to the poor methodological quality, high risk of bias, and inadequate reporting on clinical data.
- A 2015 SR of acupuncture including 23 RCTs: Our review provided evidence of acupuncture as an adjunctive therapy to medication for treating hypertension, while the evidence for acupuncture alone lowing BP is insufficient.
- A 2015 SR of xuefu zhuyu decoction (XZD) including 15 studies: This meta-analysis provides evidence that XZD is beneficial for hypertension.
- A 2015 SR of Shenqi pill including 4 RCTs: This systematic review firstly provided no definite evidence for the efficacy and safety of Shenqi pill for hypertension based on the insufficient data.
- A 2015 SR of Jian Ling Decoction (JLD) including 10 trials: Owing to insufficient clinical data, it is difficult to draw a definite conclusion regarding the effectiveness and safety of JLD for essential hypertension.
- A 2015 SR of Chinese herbal medicines (CHM) including 5 trials: No definite conclusions about the effectiveness and safety of CHM for resistant hypertension could be drawn.
- A 2015 SR of Chinese medicines (CM) including 27 RCTs: When combined with Western medines, CM as a complementary treatment approach has certain effects for the control of hypertension and protection of target organs.
- A 2015 SR of berberine including 17 RCTs: This study indicates that berberine has comparable therapeutic effect on type 2 DM, hyperlipidemia and hypertension with no serious side effect.
- A 2015 SR of garlic including 9 double-blind trials: Although evidence from this review suggests that garlic preparations may lower BP in hypertensive individuals, the evidence is not strong.
- A 2015 SR of chlorogenic acids (CGAs) including 5 studies: CGA intake causes statistically significant reductions in systolic and diastolic blood pressures.
- A 2014 SR of omega-3 fatty acid supplementation including 70 RCTs: provision of EPA+DHA reduces systolic blood pressure, while provision of ≥2 grams reduces diastolic blood pressure.
- A 2014 SR of green tea including 20 RCTs: Green tea intake results in significant reductions in systolic blood pressure
- A 2014 SR of probiotics including 9 studies: consuming probiotics may improve BP by a modest degree, with a potentially greater effect when baseline BP is elevated, multiple species of probiotics are consumed, the duration of intervention is ≥8 weeks, or daily consumption dose is ≥10(11) colony-forming units.
- A 2014 SR of yoga including 17 trials: The evidence for the effectiveness of yoga as a treatment of hypertension is encouraging but inconclusive.
- A 2014 SR of yoga including 7 RCTs: very low-quality evidence was found for effects of yoga on systolic and diastolic blood pressure.
- A 2014 SR of yoga including 120 studies: yoga is an effective adjunct therapy for HPT and worthy of inclusion in clinical guidelines.
- A 2014 SR of moxibustion: a beneficial effect of using moxibustion interventions on KI 1 to lower blood pressure compared to antihypertensive drugs.
- A 2014 SR of acupuncture including 4 sham-controlled RCTs: acupuncture significantly lowers blood pressure in patients taking antihypertensive medications.
- A 2014 SR of Tuina including 7 RCTs: The findings from our review suggest that Tuina might be a beneficial adjuvant for patients with EH
- A 2014 SR of ‘kidney tonifying’ (KT) Chinese herbal mixture including 6 studies: Compared with antihypertensive drugs alone, KT formula combined with antihypertensive drugs may provide more benefits for patients with SH.
- A 2014 SR of Tongxinluo capsule including 25 studies : There is some but weak evidence about the effectiveness of TXL in treating patients with hypertension.
- A 2014 SR of moxibustion including 5 RCTs: no confirm conclusion about the effectiveness and safety of moxibustion as adjunctive treatment for essential hypertension could be made
- A 2013 SR of Qi Ju Di Huang Wan (QJDHW) including 10 RCTs: QJDHW combined with antihypertensive drugs might be an effective treatment for lowering blood pressure and improving symptoms in patients with essential hypertension.
- A 2013 SR of yoga including 17 studies: Yoga can be preliminarily recommended as an effective intervention for reducing blood pressure.
- A 2013 SR of Tianma Gouteng Yin (TGY) including 22 RCTs: No confirmed conclusion about the effectiveness and safety of TGY as adjunctive treatment for essential hypertension … could be made.
- A 2013 SR of Zhen Gan Xi Feng Decoction (ZGXFD) including 6 RCTs: ZGXFD appears to be effective in improving blood pressure and hypertension-related symptoms for EH
- A 2013 SR of Tianmagouteng decoction including 9 RCTs: Tianmagouteng decoction can decrease both systolic and diastolic blood pressure.
- A 2013 SR of fish oil including 17 RCTs: The small but statistically significant effects of fish-oil supplements in hypertensive participants in this review have important implications for population health and lowering the risk of stroke and ischaemic heart disease.
- A 2013 SR of acupuncture including 35 RCTs: While there are some evidences that suggest potential effectiveness of acupuncture for hypertension, the results were limited by the methodological flaws of the studies.
- A 2013 SR of yoga including 6 studies: There is some encouraging evidence of yoga for lowering SBP and DBP.
- A 2012 SR of spinal manipulation therapy (SMT) including 10 studies: There is currently a lack of low bias evidence to support the use of SMT as a therapy for the treatment of
- A 2012 SR of vitamin C including 29 trials: In short-term trials, vitamin C supplementation reduced SBP and DBP.
- A 2012 SR of magnesium supplementation including 22 trials: magnesium supplementation appears to achieve a small but clinically significant reduction in BP, an effect worthy of future prospective large randomised trials using solid methodology.
- A 2012 SR of Banxia Baizhu Tianma Decoction (BBTD) including 16 RCTs: There is encouraging evidence of BBTD for lowering SBP, but evidence remains weak.
- A 2012 SR of Liu Wei Di Huang Wan (LWDHW) including 6 RCTs: LWDHW combined with antihypertensive drugs appears to be effective in improving blood pressure and symptoms in patients with essential hypertension.
- A 2012 SR of aromatherapy including 5 studies: The existing trial evidence does not show convincingly that aromatherapy is effective for hypertension.
- A 2012 empty Cochrane review: As no trials could be identified, no conclusions can be made about the role of TGYF in the treatment of primary hypertension.
- A 2012 SR of yoga including 10 studies: Not only does yoga reduce high BP but it has also been demonstrated to effectively reduce blood glucose level, cholesterol level, and body weight, major problems affecting the American society.
- A 2011 SR of L-arginine including 11 RCTs: This meta-analysis provides further evidence that oral L-arginine supplementation significantly lowers both systolic and diastolic BP.
- A 2011 SR of soy isoflavones including 14 RCTs: Soy isoflavone extracts significantly decreased SBP but not DBP in adult humans, and no dose-response relationship was observed.
- A 2010 SR of moxibustion including 4 RCTs: There is insufficient evidence to suggest that moxibustion is an effective treatment for hypertension.
- A 2010 SR of acupunctures including 20 studies: Because of the paucity of rigorous trials and the mixed results, these findings result in limited conclusions. More rigorously designed and powered studies are needed.
- A 2010 SR of cupping including 3 trials: the evidence is not significantly convincing to suggest cupping is effective for treating hypertension.
- A 2010 empty Cochrane review: There is insufficient evidence to support the benefit of Roselle for either controlling or lowering blood pressure in patients with hypertension.
- A 2009 SR of acupuncture including 11 RCTs: the notion that acupuncture may lower high BP is inconclusive.
- A 2008 SR of transcendental meditation including 9 studies: The regular practice of Transcendental Meditation may have the potential to reduce systolic and diastolic blood pressure by approximately 4.7 and 3.2 mm Hg, respectively.
- A 2008 SR of relaxation therapies including 25 trials: the evidence in favour of a causal association between relaxation and blood pressure reduction is weak.
- A 2007 SR of qigong including 12 RCTs: There is some encouraging evidence of qigong for lowering SBP, but the conclusiveness of these findings is limited.
- A 2007 SR of co-enzyme Q10 including 12 trials: coenzyme Q10 has the potential in hypertensive patients to lower systolic blood pressure by up to 17 mm Hg and diastolic blood pressure by up to 10 mm Hg without significant side effects.
- A 2007 SR of stress reduction programs including 106 studies: Available evidence indicates that among stress reduction approaches, the Transcendental Meditation program is associated with significant reductions in BP.
- A 2006 Cochrance review of magnesium supplementation including 12 RCTs: the evidence in favour of a causal association between magnesium supplementation and blood pressure reduction is weak and is probably due to bias.
- A 2006 Cochrane review of calcium supplementation including 13 RCTs: evidence in favour of causal association between calcium supplementation and blood pressure reduction is weak and is probably due to bias.
ALMOST 100 NEW SRs!
To be honest, if I had known the volume of the material, I would probably not have tackled this task. Since the publication of my mini-review in 2005, there has been an explosion of similar papers:
- 1 in 2005
- 2 in 2006
- 3 in 2007
- 2 in 2008
- 1 in 2009
- 4 in 2010
- 2 in 2011
- 8 in 2012
- 8 in 2013
- 12 in 2014
- 12 in 2015
- 6 in 2016
- 9 in 2017
- 7 in 2018
- 12 in 2019
As this is based on very simple Medline searches, the list is certainly not complete. Despite this fact, several conclusions seem to emerge:
- There is no shortage of SCAMs that have been tested for hypertension.
- Most seem to have positive effects; in many cases, they seem too good to be true.
- Many of the SRs are of poor methodological quality, based on poor quality primary studies, published in less than reputable journals. Some SRs, for instance, include studies without a control group which is likely to lead to false-positive overall conclusions about the effectiveness of the SCAM in question.
- In recent years, there are more and more SRs by Chinese authors focussed on Chinese herbal mixtures that are unknown and unobtainable outside China. These SRs are invariably based on studies published in Chinese language in journals that are inaccessible. This means it is almost impossible for the reader, reviewer or editor to check their accuracy. The reliability of the conclusions of these SRs must therefore be doubted.
- Most of the primary studies included in the SRs lack long-term data. Thus the usefulness of the SCAM in question is questionable.
- With several of the SCAMs, the dose of the treatment and treatment schedule is less than clear. For instance, one might ask how frequently a patient should have acupuncture to control her hypertension.
- Some of the SCAMs assessed in these SRs seem of doubtful practicality. For instance, it might not be feasible nor economical for patients to receive regular acupuncture to manage their blood pressure.
- Several contradictions emerge from some of the SRs of the same modality. This is particularly confusing because SRs are supposed to be the most reliable type of evidence. In most instances, however, the explanation can easily be found by looking at the quality of the SRs. If SRs are based on uncontrolled studies, or if they fail to critically evaluate the reliability of the included primary trials, they are likely to arrive at conclusions that are too positive. Examples for such confusion are the multiple SRs of co-enzyme Q10 or the three yoga SRs of 2014.
- Because of this confusion, SCAM advocates are able to select false-positive SRs to support their opinion that SCAM is effective.
- Despite a substantial amount of positive evidence, none of the SCAMs have become part of the routine in the management of hypertension. A 2013 statement by the American Heart Association entitled Beyond medications and diet: alternative approaches to lowering blood pressure: a scientific statement from the american heart association concluded that it is reasonable for all individuals with blood pressure levels >120/80 mm Hg to consider trials of alternative approaches as adjuvant methods to help lower blood pressure when clinically appropriate. A suggested management algorithm is provided, along with recommendations for prioritizing the use of the individual approaches in clinical practice based on their level of evidence for blood pressure lowering, risk-to-benefit ratio, potential ancillary health benefits, and practicality in a real-world setting.
What lessons might this brief overview of SRs teach us? I think the following points are worth considering:
- Systematic reviews are the best type of evidence we have for estimating the effectiveness of treatments. But it is essential that they include a strong element of CRITICAL evaluation of the primary studies. Without it, a SR is incomplete and potentially counter-productive.
- The primary studies of SCAM are far too often of poor quality. This means that researchers should thrive to improve the rigour of their investigations.
- Both poor-quality primary studies and uncritically conducted SRs are prone to yielding findings that are too good to be true.
- Editors and reviewers have a responsibility to prevent the publication of trials and SRs that are of poor quality and thus likely to mislead us.
- Those SCAMs that have shown promising effects on hypertension (for instance Tai chi) should now be submitted to further independent scrutiny to find out whether their efficacy and usefulness can be confirmed, for instance, by 24-h ambulatory and daily home blood pressure monitoring and studies testing their acceptability in real life settings. Subsequently, we ought to determine whether the SCAM in question can be reasonably integrated in routine blood pressure management.
- The adjunctive use of a SCAM that has been proven to be effective and practical seems a reasonable approach. Yet, it requires proper scientific scrutiny.
- There is a paucity of cost-effectiveness studies and investigations of the risks of SCAM which needs to be addressed before any SCAM is considered for routine care.