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Actaea racemosa (Black Cohosh)
Leading herb for menopause symptoms, particularly hot flashes, with evidence comparable to low-dose estrogen for some women.
What the evidence says
Black Cohosh helped in about half (6/9) of the studies that measured an effect — promising, but not unanimous.
Most evidence is from high-quality meta-analyses and randomised trials published 2003–2026 with a typical study size of 304 participants.
Based on 43 studies · 7 meta-analyses · 14 RCTs · 75,821 total participants
Confidence
HighWhat the studies found
By outcome
See full supplement plans that include Black Cohosh.
Black Cohosh has an evidence score of 7.5/10 — strong evidence based on 43 indexed studies, including 5 meta-analyses. Leading herb for menopause symptoms, particularly hot flashes, with evidence comparable to low-dose estrogen for some women.
The commonly studied dose of Black Cohosh is 20-40mg standardized extract (1mg triterpene glycosides). Research points to an estimated optimal dose around 80mg, with a minimum effective dose near 20mg. Individual response varies — start low and adjust.
Timing is flexible for Black Cohosh — consistent daily use matters more than the time of day. Black cohosh (Actaea racemosa) triterpene glycosides work through modulation of serotonin receptors and possibly opioid receptors, not primarily via estrogenic activity as once thought.
Last reviewed May 2026 · evidence from 38 studies · how we score
This information is for educational purposes only. It is not a substitute for professional medical advice. Always consult a qualified healthcare provider before starting, stopping, or changing any supplement or medication.
Black Cohosh is the most well-researched herb for menopausal symptoms. Native American women used it for centuries, and modern studies confirm benefits for hot flashes, night sweats, and mood. Unlike hormone therapy, it doesn't appear to affect estrogen-sensitive tissues, making it an option for women who can't or prefer not to use hormones.
Affects brain temperature control centers
Does not act like estrogen on tissues
How Black Cohosh works — from molecular targets to health outcomes. Click an edge to see supporting research.This visualization is in beta — pathways are being refined and expanded.
20-40mg standardized extract (1mg triterpene glycosides)
Can be taken without food
| Form | Type |
|---|---|
| 💊Standardized extract (2.5% triterpene glycosides) | Recommended |
| 💊Remifemin (most studied brand) | Alternative |
| 💊Dried root | Alternative |
Remifemin is the most clinically studied preparation. Look for standardized extracts.
Minimum: 8 weeks
Optimal: 12 weeks
Cycling: German Commission E recommends limiting to 6 months. Take breaks or use under supervision long-term.
Note: Can be taken any time. Split dosing (twice daily) may provide more consistent effects.
Based on multiple meta-analyses showing modest improvement in hot flashes. Isopropanolic extracts (iCR) showed most consistent effects. Effect sizes were larger at higher dosages but evidence shows only moderate benefit overall.
Fewer and less severe hot flashes
Fewer night sweats, better sleep
Reduced mood swings and irritability
Avoid — Uterine stimulant effects and potential hepatotoxicity
Likely safe (non-estrogenic), but consult oncologist
May add to liver stress
May have unclear interactions
May theoretically interact; limited data
Tip: Take with food
Tip: Usually resolves
Tip: Monitor liver function; stop if symptoms occur
Different mechanisms for menopause support
Multi-target menopause symptom relief
Traditional combination for menopausal support
Enhanced support for women's health symptoms
Different mechanisms for menopausal support
Enhanced relief from menopausal symptoms
Often combined for menopausal support
Multi-herb approach to menopausal symptoms
Complementary phytoestrogenic herbs that together provide broader coverage of menopausal symptoms including hot flashes, mood disturbances, and sleep disruption.
Enhanced menopausal symptom relief targeting vasomotor, psychological, and cognitive domains
Black Cohosh is generally safe at recommended doses, with a few precautions worth noting. The most commonly reported side effects are GI upset, headache, liver problems (rare). Use caution if any of these apply to you: Liver disease; Pregnancy; Hormone-sensitive conditions (controversial — may be safer than thought).
Vitex
Likely helpsLeading herb for women's hormonal balance, with strong evidence for PMS relief and menstrual cycle regulation.
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