Aromatherapy is popular and pleasant – but does it have real health effects? The last time I tried to find an answer to this question was in 2012. At that time, our systematic review concluded that “the evidence is not sufficiently convincing that aromatherapy is an effective therapy for any condition.” But 5 years can be a long time in research, and more up-to-date information would perhaps be helpful.
This systematic review of 2017 aimed to provide an analysis of the clinical evidence on the efficacy of aromatherapy specifically for depressive symptoms on any type of patients. The authors searched 5 databases for relevant studies Outcome measures included scales measuring depressive symptoms levels. Twelve randomized controlled trials (RCTs) were included. Aromatherapy was administered by inhalation (5 studies) or massage (7 studies). Seven RCTs showed improvement in depressive symptoms. The quality of half of the studies was low, and the administration protocols varied considerably among the studies. Different assessment tools were employed in the studies. In 6 of the RCTs, aromatherapy was compared to no intervention.
Despite these caveats, the authors concluded that aromatherapy showed potential to be used as an effective therapeutic option for the relief of depressive symptoms in a wide variety of subjects. Particularly, aromatherapy massage showed to have more beneficial effects than inhalation aromatherapy.
Apart from the poor English, this paper is irritating because of the almost total lack of critical input. Given that half of the trials were of poor quality (only one was given the full points on the quality scale) and many totally failed to control for placebo-effects, I think that calling aromatherapy an effective therapeutic option for the relief of depressive symptoms is simply not warranted. In fact, it is highly misleading and, given the fact that depression is a life-threatening condition, it seems unethical and dangerous.
Considering these facts, my conclusion remains that “the evidence is not sufficiently convincing that aromatherapy is an effective therapy for any condition, including depression.”