Skip to content
Back to Menopause Support

ingestible · for menopause support

Black Cohosh (Actaea racemosa)

Reviewed by the Nimbera editorial team · Last updated May 2026

Borrelli & Ernst 2008 systematic review (Maturitas, PMID 18585461) - 16 RCTs found black cohosh standardised extract (Remifemin) significantly reduced hot flash frequency and severity vs placebo in perimenopausal/menopausal women with >5 hot flushes/day at baseline. Most trials used 40 mg/day isopropanolic extract.$15-$25/month.

How to use

Take 20-40 mg/day of standardised black cohosh extract (isopropanolic extract, e.g., Remifemin brand) in divided doses with food. Allow 8-12 weeks to assess effect. Do not exceed 6 months of continuous use without medical review. Remifemin is the most studied and recommended brand.

How it works

Black cohosh does not act as a direct estrogen agonist (despite earlier theories). Current evidence suggests it modulates serotonergic, dopaminergic, and opioid receptors in the hypothalamus - the region responsible for thermoregulatory control. This likely explains its hot flash-reducing effect without the estrogen-pathway concerns.

Where to buy

Remifemin ($15-$25/60 tablets, the gold-standard studied brand), Nature's Way Black Cohosh ($10-$18/60 capsules), Natrol Black Cohosh ($12-$20) - available at pharmacies and health food stores.

Typical cost: $15-$25/month.

Safety notes

Rare but serious: hepatotoxicity (liver damage) cases have been reported with some black cohosh products, though causality is debated. Monitor for signs of liver problems (jaundice, fatigue, abdominal pain). Do not use in pregnancy (uterine-stimulating effects) or with known liver disease. Previously thought to be contraindicated in estrogen-receptor-positive breast cancer, but current evidence suggests black cohosh does not act on ER pathways - consult oncologist for individual guidance. Limit use to 6 months at a time.

Drug & supplement interactions

  • Always tell your doctor or pharmacist about any supplements you take.
  • Interactions can occur with prescription medications, blood thinners, and immunosuppressants.
  • Herbal remedies can affect how the body absorbs or metabolises drugs.
  • Check drugs.com interactions checker before starting.

Clinical source

Borrelli & Ernst 2008 - Maturitas (PMID 18585461)

This information is compiled from primary clinical literature and is for informational purposes only. It is not a substitute for professional medical advice. Read our full disclaimer.