tuneTypical Dose
Trials commonly use standardized extracts providing roughly 40 to 160 mg daily depending on formulation
Botanical
Black Cohosh
Actaea racemosa
Evidence TierCWADA NOT PROHIBITED
watchEffect Window
Trial-based symptom changes are usually assessed over several weeks, not after a few days.
check_circleCompliance
WADA NOT PROHIBITED
Overview
Clinical Summary
Black cohosh may modestly improve menopausal symptoms with some standardized extracts, but the evidence is mixed and it is not a dependable substitute for proven vasomotor-symptom therapies.
Black cohosh is one of the most studied menopause botanicals, but the literature is inconsistent. Some meta-analytic and small randomized data suggest symptom improvement with certain extracts. Several larger placebo-controlled trials found no meaningful benefit, and a newer positive 2025 trial used a multi-ingredient product that cannot isolate black cohosh. That makes black cohosh a maybe-helpful, formulation-sensitive option for some menopausal symptoms, not a clearly reliable treatment for hot flashes.
Black cohosh does not appear to act like straightforward estrogen replacement. Proposed mechanisms include serotonergic, neuroendocrine, and central thermoregulatory effects, but the clinical literature is too inconsistent to tie a confident mechanism to a dependable symptom benefit.
Outcomes
What This Is Expected To Influence
Primary Outcomes
- Possible modest improvement in overall menopausal symptoms with certain extracts
Secondary Outcomes
- Inconsistent effects on hot flashes and night sweats
- Evidence does not support broad hormone-balancing claims
Safety
Contraindications and Interactions
Contraindications
- Pregnancy
- Active liver disease
- Hormone-sensitive condition
Side effects
- GI upset
- Headache
- Rash
Interactions
- Hepatotoxic drugs or heavy alcohol use
- Hormone-directed therapies
Avoid if
- You are trying to self-manage severe menopausal symptoms instead of using evidence-based care
- You have unexplained vaginal bleeding or significant liver concerns
Evidence
Study-level References
bco-SRC-001Meta-analysis
Sourceopen_in_newSadahiro R, et al. Black cohosh extracts in women with menopausal symptoms: an updated pairwise meta-analysis. Menopause. 2023. doi:10.1097/GME.0000000000002196. PMID:37192826.
Population: Menopausal women from randomized trials of black cohosh extracts alone or in related regimens.
Dose protocol: Standardized black cohosh extracts alone or in related regimens across randomized trials
Key findings: Pooled improvement in overall menopausal symptoms and hot flashes versus placebo, with no clear effect on anxiety or depression.
Notes: Best modern synthesis, but heterogeneous.
Paper content
This is the best modern synthesis of the black cohosh literature. It found pooled improvements in overall menopausal symptoms and hot flashes, but the literature remains heterogeneous and product specific, which limits how confidently the result can be generalized to any black cohosh supplement.
bco-SRC-002Randomized controlled trial
Sourceopen_in_newNewton KM, et al. Treatment of vasomotor symptoms of menopause with black cohosh, multibotanicals, soy, hormone therapy, or placebo: a randomized trial. Ann Intern Med. 2006. PMID:17179056.
Population: Women aged 45 to 55 years in menopausal transition or postmenopause with at least two vasomotor symptoms per day.
Dose protocol: 160 mg daily black cohosh in the HALT trial
Key findings: No meaningful benefit over placebo for vasomotor symptoms over 12 months.
Notes: Important large negative RCT.
Paper content
The HALT trial is one of the most important black cohosh studies because it was large, placebo controlled, and long. Black cohosh at 160 mg daily did not improve vasomotor symptoms compared with placebo over 12 months.
bco-SRC-003Randomized controlled trial
Sourceopen_in_newGeller SE, et al. Safety and efficacy of black cohosh and red clover for the management of vasomotor symptoms: a randomized controlled trial. Menopause. 2009. PMID:19609225.
Population: Postmenopausal women randomized to black cohosh, red clover, placebo, or hormone therapy arms.
Dose protocol: Standardized black cohosh versus placebo over 12 months
Key findings: Black cohosh did not outperform placebo for vasomotor symptoms.
Notes: Another key negative RCT.
Paper content
This long placebo-controlled trial also failed to show meaningful benefit from black cohosh for vasomotor symptoms. The placebo arm improved more than the black cohosh arm, reinforcing how inconsistent the clinical picture is.
bco-SRC-004Randomized, double-blind, placebo-controlled trial
Sourceopen_in_newPokushalov E, Ponomarenko A, Garcia C, Kasimova L, Pak I, Shrainer E, Romanova A, Kudlay D, Johnson M, Miller R. Assessing the combined effects of Black Cohosh, Soy Isoflavones, and SDG Lignans on menopausal symptoms: a randomized, double-blind, placebo-controlled clinical trial. Eur J Nutr. 2025;64(3):138. doi:10.1007/s00394-025-03588-y. PMID:40131516.
Population: Postmenopausal women aged 45 to 60 years with menopausal symptoms.
Dose protocol: Combined black cohosh, soy isoflavones, and SDG lignans versus placebo for 90 days in 96 postmenopausal women.
Key findings: Total MRS score reduced by 48% (P<0.01). Somatic, psychological, and urogenital domains all significantly improved. Modest FSH reduction and estradiol increase also observed.
Notes: Combination product limits black cohosh attribution. Registered trial (NCT06328348). Adds to the evidence that black cohosh-containing formulations may help, even if isolating black cohosh's contribution remains difficult.
Paper content
This double-blind RCT in 96 postmenopausal women found that a combination of Black Cohosh, Soy Isoflavones, and SDG Lignans significantly reduced Menopause Rating Scale scores across somatic, psychological, and urogenital domains over 90 days compared to placebo. Modest hormonal changes (reduced FSH, increased estradiol) were also observed. The combination design means the individual contribution of black cohosh cannot be isolated, but the trial adds to the evidence that black cohosh-containing formulations may help with menopausal symptoms.