What supplements are commonly used for menopause symptoms?
Last updated: August 2026 · Reviewed by the FactoWiki Editorial Team for clarity and source accuracy
The most used are black cohosh, soy isoflavones, red clover, evening primrose oil and St John's wort. Black cohosh and soy isoflavones have the most human data, and even that is inconsistent. None approaches the effect of hormone therapy, which remains the most effective treatment for hot flushes.
Key takeaways
- Black cohosh and soy isoflavones have the most trials, with mixed results.
- Placebo response in hot flush trials is very high — often 30–50% — which complicates everything.
- St John's wort helps low mood but interacts with a long list of medications.
What has been studied most
Black cohosh has numerous trials with genuinely conflicting results; some show reduced hot flush frequency, others no difference from placebo. Soy isoflavones act weakly on oestrogen receptors and meta-analyses suggest a modest reduction in hot flush frequency, larger in women who can metabolise daidzein to equol — a capacity roughly a third of Western women have. Red clover is another isoflavone source with weaker data.
The placebo problem
Hot flush trials consistently show placebo responses of 30–50%. That is unusually high and it means small or poorly controlled studies will find apparent benefits that do not survive rigorous testing. It also means personal reports of a supplement working are genuinely unreliable in this specific area — more so than in most.
For symptoms other than hot flushes
St John's wort has reasonable evidence for the low mood that accompanies menopause, but it induces CYP3A4 and interacts with oral contraceptives, anticoagulants, some antidepressants, tamoxifen and many other drugs — a serious and frequently overlooked issue. Vaginal dryness responds better to local oestrogen or moisturisers than anything oral. Vitamin D and calcium matter for the bone loss that accelerates after menopause.
Key ingredients to understand
The ingredients most relevant to this question, with what the evidence actually supports:
- Black Cohosh — Black cohosh is one of the most-used herbs for menopausal hot flushes. Evidence is mixed, and rare liver-safety reports mean it is not…
- Red Clover — Red clover is a source of plant oestrogens (isoflavones) marketed for menopausal symptoms. Trial results are inconsistent, and hormone-related…
- Vitamin D — Vitamin D is essential for bones and plays a role in immunity. Deficiency is common, and supplementing clearly helps if you are low — but large…
Frequently asked questions
Are these safer than HRT?
Not necessarily, and the framing is misleading. Black cohosh has liver injury reports; St John's wort has extensive interactions. HRT risks and benefits depend on age, time since menopause and personal history — a discussion worth having properly with a doctor rather than avoiding.
How long before they work?
Trials generally run 8–12 weeks. Judge at three months.
Who should avoid phytoestrogens?
Anyone with a history of hormone-sensitive breast cancer, or taking tamoxifen or an aromatase inhibitor, should get specialist advice first.
Related on FactoWiki
- All health answers
- Ingredient evidence guides
- Black Cohosh — ingredient guide
- Red Clover — ingredient guide
- How we review
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