Most group person heard of St John's Wort and omega-3s. But did you cognize location are a batch much over-the-counter herbal products and supplements retired location targeting depression? In our reappraisal of objective tests of these products, we recovered 64 different over-the-counter (OTC) products that person been evaluated for slump – but pinch differing levels of grounds for each.
Why look astatine this topic?
Depression is progressively common, to nan grade that it is sometimes described arsenic an epidemic. In nan UK, 11.3% of group study mild depressive symptoms, 4.2% mean depressive symptoms, and 3.3% terrible depressive symptoms. Many of america cognize personification who struggles pinch insignificant aliases mean levels of depression, aliases we whitethorn struggle from depressive symptoms ourselves. Often, we will effort galore things to help, specified arsenic antidepressants, talking therapies, meditation, aliases exercise. One communal curen group effort is OTC products which are wide disposable and accessible from supermarkets, pharmacies, wellness nutrient shops, and online.
Once you commencement looking into which OTC merchandise mightiness beryllium helpful, nan database becomes endless. This is peculiarly nan lawsuit if you publication online blogs aliases look astatine societal media promotion of various products. How do we cognize what is evidence-based? What products are effective? Are they safe?
Given my background, I was people willing successful knowing which products mightiness beryllium adjuvant and wherever investigation should attraction next.
What did we do?
As a squad we reviewed 23,933 study records and 1,367 papers. Overall, we recovered 209 objective tests that assessed 64 OTC products for slump wherever nan merchandise was taken for much than 1 week. We focussed connected nan astir rigorous measurement of evaluating nan effectiveness and information – objective trials. Studies successful adults aged 18-60 years pinch slump symptoms aliases a diagnosis were included. We besides checked if location was an property bias by reviewing tests successful older group separately and recovered location is. This task is portion of a larger bid of studies, besides looking into products for worry and insomnia.
It tin beryllium challenging to categorize OTC products – different countries person different regulations, and immoderate products are commonly utilized successful immoderate places but not successful others. Two volunteers from nan nationalist helped america to constrictive our choices, which helped america exclude immoderate very obscure products, specified arsenic eels' caput powder!
So what did we find?
We anticipated a batch of studies, but complete 200 was much than we expected! We had to enlistee an intern to thief america to benignant done nan findings. Studies were not ever straightforward – immoderate tested aggregate doses aliases products, immoderate were successful summation to antidepressants and successful immoderate tests group had a scope of beingness conditions successful summation to depression. We grouped our findings into products pinch substantive grounds (more than 10 trials), emerging grounds (between 2 and 9 trials), and azygous tests only.
The products pinch substantive grounds are those that are good known – omega-3s (39 trials), St John's Wort (38), probiotics (18) and vitamin D (14) – arsenic good arsenic saffron (18), which is important successful nan Middle East and parts of Asia.
Compared to placebo, less omega-3 tests recovered effects for slump than those that recovered nary effects. However, St John's Wort and saffron much often showed effects compared to placebo, and akin results to medicine antidepressants. Probiotics and vitamin D were much apt to trim depressive symptoms than placebo.
Out of nan 18 products pinch emerging evidence, folic acid, lavender, zinc, tryptophan, rhodiola, and citrus balm were nan astir promising. Bitter orange, Persian lavender, and chamomile beverage besides showed affirmative effects successful 2 tests each. Some products that are gaining successful popularity, specified arsenic melatonin, magnesium, and curcumin, showed mixed effects upon slump crossed aggregate objective trials. Mixed results were besides recovered for cinnamon, echium, vitamin C, and a operation of vitamin D positive calcium. Prebiotics, which support nan bully germs successful our gut, and a supplement called SAMe did not look to beryllium amended than placebo. 41 products had only a azygous proceedings available. This is adjuvant arsenic a starting point, but does not springiness america conclusive evidence.
It's bully news that very fewer information concerns arose from immoderate of these products, whether they were taken unsocial aliases successful operation pinch antidepressants. However, a healthcare master should ever beryllium consulted connected whether a merchandise mightiness interact pinch thing other you are taking. A higher modular of information reporting successful tests is basal – only 145 (69%) of nan examined studies afloat reported immoderate broadside effects from nan products.
What do we urge for nan future?
Whilst 89 tests tested products successful operation pinch antidepressants, fewer looked astatine whether taking OTC products whilst having talking therapies has an further effect. There was besides only 1 study that looked astatine whether taking an OTC merchandise (folic acid) saved nan wellness work money – it was not much effective than placebo and did not lead to savings – but knowing much astir this would beryllium useful successful future. Some grounds is besides disposable for often overlooked OTC products.
So, what we person is comparatively conclusive grounds for immoderate products. When we looked astatine surveys of what group commonly take, chamomile, lavender, citrus balm, and echium emerged arsenic commonly consumed products pinch an emerging grounds base, which we urge beryllium studied further. Other commonly utilized herbal medicines for depressive symptoms are ginseng, gingko, lime flowers, orangish blossom, and peppermint, but nary studies person evaluated these products. Thus, our study has pioneered an exploration into what investigation is needed to further measure specified wide utilized wellness attraction products.
Source:
Journal reference:
Frost, R., et al.(2025). Understanding nan investigation scenery of over-the-counter herbal products, dietary supplements, and medications evaluated for depressive symptoms successful adults: a scoping review. Frontiers successful Pharmacology. doi.org/10.3389/fphar.2025.1609605.