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Black Cohosh

Relieving menopausal symptoms, particularly hot flashes, night sweats, and mood changes in perimenopausal women.

herb
Systematic review availableHuman trial evidenceTraditional useInteraction riskNeeds more research

Black cohosh is a popular botanical supplement used primarily to manage menopausal symptoms like hot flashes and night sweats. Evidence suggests it may offer relief for some women, though overall clinical results remain mixed.

Last reviewed June 13, 2026 · AI-assisted, human-reviewed
Black cohosh (Actaea racemosa) is a perennial herb native to North America, traditionally utilized for its potential effects on the female reproductive system. It has become one of the most widely researched botanical supplements for managing symptoms associated with the menopausal transition, including hot flashes, night sweats, and mood disruptions. While conventional hormone replacement therapy (HRT) remains the gold standard for symptom relief, many women explore black cohosh as a non-hormonal alternative due to concerns regarding side effects or contraindications associated with estrogen therapy. Modern clinical interest often focuses on its standardized extracts, sometimes in combination with other botanicals like St. John's Wort or soy isoflavones, to improve quality of life during perimenopause and postmenopause.

Quick answer

What it is: Black cohosh (Actaea racemosa) is a perennial herb native to North America, traditionally utilized for its potential effects on the female reproductive system.

May support:Perimenopause, Menopause

Evidence Summary

Several systematic reviews and clinical trials indicate that black cohosh may reduce the frequency and severity of vasomotor symptoms. For instance, a 2025 RCT demonstrated significant symptom reduction when combined with other botanicals, and a 2016 systematic review noted it as a common CAM therapy used when HRT is avoided. Some studies suggest superior efficacy when combined with St. John's Wort for psychological climacteric symptoms.

Last reviewed · Jun 2026

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Why It Works

The exact mechanism remains under investigation; however, it is thought to act via central nervous system pathways rather than strictly as a phytoestrogen. It may modulate neurotransmitters involved in thermoregulation and mood, such as serotonin, though its direct impact on estrogen receptors in breast or uterine tissue appears minimal.

How it works in more detail

Historically categorized as a phytoestrogen, more recent research suggests black cohosh may function as a selective estrogen receptor modulator (SERM) or through non-estrogenic pathways. It appears to influence the hypothalamus, the brain's thermostat, potentially via serotonergic or dopaminergic signaling. This central action may explain its effect on vasomotor symptoms like hot flashes without the proliferative risks to the endometrium often associated with traditional estrogen therapy. Furthermore, its potential interaction with opioid receptors has been studied in the context of pain and mood regulation.

How to use

Always consult a qualified clinician.

Editorial guidance

Suggested dosage
20–80 mg/day standardized
Research dosage range
Commonly studied dosages of standardized extracts range from 20 mg to 40 mg twice daily, often standardized to 2.5% triterpene glycosides.
Typical onset
Initial improvements are typically reported within 4 to 8 weeks of consistent use, with maximal effects often seen after 12 weeks.
Typical forms
Capsule, Tablet, Tincture, Tea
Quality markers
Look for products standardized to triterpene glycosides, such as 27-deoxyactein. Reputable brands often provide third-party testing for purity and potency. Ensure the product specifies the species Actaea racemosa (formerly Cimicifuga racemosa) to avoid confusion with other cohosh varieties.
Medication interactions
  • Hormone replacement therapy
  • Liver-metabolized drugs
Avoid if
  • Pregnant
  • Breastfeeding
  • History of liver disease
  • Hormone-sensitive conditions (e.g., breast cancer, uterine fibroids)
  • Allergy to plants in the Ranunculaceae family

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Suggested dosage

20–80 mg/day standardized

General guidance — discuss specifics with a clinician.

Active medicinal compounds

Triterpene glycosides (e.g., actein, cimicifugoside, 27-deoxyactein), phenylpropanoids (e.g., ferulic acid, caffeic acid), and flavonoids.

Traditional use

Native Americans traditionally used black cohosh root for various conditions, including gynecological issues, kidney problems, sore throats, and snakebites. In the 19th century, it gained popularity in eclectic medicine for women's health, particularly for menstrual irregularities and menopausal symptoms. Its use for menopausal complaints has continued into modern herbal practice.

Safety

Safety warnings

While generally considered safe for short-term use, there have been rare reports of liver toxicity, necessitating caution in individuals with pre-existing liver conditions. Side effects may include gastrointestinal upset, headache, or dizziness. Due to its potential hormonal influence, consultation with a healthcare provider is recommended for women with a history of hormone-sensitive cancers.

Avoid if

  • Pregnant
  • Breastfeeding
  • History of liver disease
  • Hormone-sensitive conditions (e.g., breast cancer, uterine fibroids)
  • Allergy to plants in the Ranunculaceae family

Medication interactions

  • Hormone replacement therapy
  • Liver-metabolized drugs

Reported side effects

  • Gastrointestinal upset
  • Headache
  • Rash
  • Weight gain
  • Vaginal spotting
  • Dizziness

General guidance — discuss specifics with a clinician.

Evidence ecosystem

Scientific literature, clinical guidance, government sources, ongoing research, traditional use, and lived experience — grouped by source type and quality.

Overall grade

Several systematic reviews and clinical trials indicate that black cohosh may reduce the frequency and severity of vasomotor symptoms. For instance, a 2025 RCT demonstrated significant symptom reduction when combined with other botanicals, and a 2016 systematic review noted it as a common CAM therapy used when HRT is avoided. Some studies suggest superior efficacy when combined with St. John's Wort for psychological climacteric symptoms.

Filter by source type

Systematic Reviews(3)

Structured reviews of the full body of evidence (incl. Cochrane).

Very High Quality
  • Complementary therapies for management of menopausal symptoms: a systematic review to inform the update of the International Menopause Society recommendations on women's midlife health.

    Maunder A, Mardon AK, Rao V, Torkel S, Metri NJ, Liu J · Climacteric : the journal of the International Menopause Society · 2026

    Menopausal hormone therapy is standard treatment, but some women use complementary therapies. This review examines complementary therapies for menopause to inform International Menopause Society (IMS) recommendations. A systematic search of six databases (January 2022-December 2024) identified randomized controlled trials (RCTs) and systematic reviews on complementary therapies for menopause. Outcomes included menopausal, vasomotor, genitourinary, cardiometabolic, sleep symptoms, bone health and safety. The study quality and certainty of evidence were evaluated using Cochrane Risk of Bias (RoB2), A MeaSurement Tool to Assess Systematic Reviews (AMSTAR 2) and Grading of Recommendations, Assessment, Development, and Evaluation (GRADE). From 3187 citations, 158 studies were included: one overview, 36 meta-analyses, seven systematic reviews and 114 RCTs. While promising evidence was found for acupuncture, Chinese herbal medicine (CHM), herbs, nutrients, mind-body/touch therapies for a va

    Systematic ReviewPubMedVery High Quality
  • Herbal medicine for depression and anxiety: A systematic review with assessment of potential psycho-oncologic relevance.

    Yeung KS, Hernandez M, Mao JJ, Haviland I, Gubili J · Phytotherapy research : PTR · 2018

    Anxiety and depression are prevalent among cancer patients, with significant negative impact. Many patients prefer herbs for symptom relief to conventional medications which have limited efficacy/side effects. We identified single-herb medicines that may warrant further study in cancer patients. Our search included PubMed, Allied and Complementary Medicine, Embase, and Cochrane databases, selecting only single-herb randomized controlled trials between 1996 and 2016 in any population for data extraction, excluding herbs with known potential for interactions with cancer treatments. One hundred articles involving 38 botanicals met our criteria. Among herbs most studied (≥6 randomized controlled trials each), lavender, passionflower, and saffron produced benefits comparable to standard anxiolytics and antidepressants. Black cohosh, chamomile, and chasteberry are also promising. Anxiety or depressive symptoms were measured in all studies, but not always as primary endpoints. Overall,

    Systematic ReviewPubMedVery High Quality
  • Hormone Therapy and Other Treatments for Symptoms of Menopause.

    Hill DA, Crider M, Hill SR · American family physician · 2016

    The results of large clinical trials have led physicians and patients to question the safety of hormone therapy for menopause. In the past, physicians prescribed hormone therapy to improve overall health and prevent cardiac disease, as well as for symptoms of menopause. Combined estrogen/progestogen therapy, but not estrogen alone, increases the risk of breast cancer when used for more than three to five years. Therefore, in women with a uterus, it is recommended that physicians prescribe combination therapy only to treat menopausal symptoms such as vasomotor symptoms (hot flashes) and vaginal atrophy, using the smallest effective dosage for the shortest possible duration. Although estrogen is the most effective treatment for hot flashes, nonhormonal alternatives such as low-dose paroxetine, venlafaxine, and gabapentin are effective alternatives. Women with a uterus who are using estrogen should also take a progestogen to reduce the risk of endometrial cancer. Women who cannot tolerate

    Systematic ReviewPubMedVery High Quality

Randomized Human Trials(2)

Controlled human studies with random assignment.

High Quality
  • Assessing the combined effects of Black Cohosh, Soy Isoflavones, and SDG Lignans on menopausal symptoms: a randomized, double-blind, placebo-controlled clinical trial.

    Pokushalov E, Ponomarenko A, Garcia C, Kasimova L, Pak I, Shrainer E · European journal of nutrition · 2025 · n=90

    This randomized, double-blind, parallel-group clinical trial aimed to evaluate the efficacy of Black Cohosh, Soy Isoflavones, and SDG Lignans in alleviating menopausal symptoms compared to a placebo. Ninety-six postmenopausal women aged 45-60 years were enrolled. Participants were randomized to receive either the study supplements or a placebo for 90 days, with Menopause Rating Scale (MRS) scores collected at baseline and every 4 weeks to monitor symptom changes. Secondary outcomes assessed included hormonal variations and the incidence of adverse symptoms. Of the initial cohort, 90 participants completed the study with high adherence. Significant improvements were observed in the treatment group across all MRS domains: somatic (- 54.3% difference, p < 0.01), psychological (- 54.3% difference, p < 0.01), urogenital (-37.3% difference, p < 0.01), and total score (- 48.0% difference, p < 0

    Randomized TrialPubMedHigh Quality
  • Alternative and complementary therapies for the menopause.

    Borrelli F, Ernst E · Maturitas · 2010

    The use of complementary and alternative medicine (CAM) among menopausal women has increased in the last years. This review examines the evidence from systematic reviews, RCTs and epidemiological studies of CAM in the treatment of menopausal symptoms. Some evidence exists in favour of phytosterols and phytostanols for diminishing LDL and total cholesterol in postmenopausal women. Similarly, regular fiber intake is effective in reducing serum total cholesterol in hypercholesterolemic postmenopausal women. Clinical evidence also exists on the effectiveness of vitamin K, a combination of calcium and vitamin D or a combination of walking with other weight-bearing exercise in reducing bone mineral density loss and the incidence of fractures in postmenopausal women. Black cohosh appears to be effective therapy for relieving menopausal symptoms, primarily hot flashes, in early menopause. Phytoestrogen extracts, including isoflavones and lignans, appear to have only minimal effect on hot flash

    Randomized TrialPubMedHigh Quality

Observational Studies(6)

Cohort, case-control, and cross-sectional human studies.

Moderate Quality
  • Effectiveness of Multisymptom Support for Better Relief and Alleviation of Common Effects in Perimenopause (EMBRACE PERIMENOPAUSE).

    Choudhury R, Coelho K, Suryawanshi S, Hajare A, Kumar A · Cureus · 2025

    Menopause affects 1.5 million women annually, with perimenopause lasting 2-8 years and causing symptoms like hot flashes, sleep disturbances, mood changes, and joint pain. While hormone replacement therapy (HRT) is effective, safety concerns limit its use, leading many women to seek nonhormonal alternatives. Nutraceuticals such as ashwagandha, vitex, and black cohosh offer potential benefits, with 80% of women using supplements. This study evaluates the efficacy and safety of Arth perimenopause multisymptom capsules, providing evidence for nutraceuticals as an alternative to HRT. The Effectiveness of Multisymptom Support for Better Relief and Alleviation of Common Effects in Perimenopause (EMBRACE PERIMENOPAUSE) study was a prospective, observational trial conducted at Redkar Hospital and Research Center, Goa. Thirty perimenopausal women aged 40-48 years with irregular menstrual cycles and at least two menopausal symptoms received one Arth capsule daily for 60 days. Using standardized

    Observational StudyPubMedLow Quality
  • The role of diet in managing menopausal symptoms: A narrative review.

    Yelland S, Steenson S, Creedon A, Stanner S · Nutrition bulletin · 2023

    Menopause is a natural stage that occurs when women stop menstruating, during which many women experience physical and psychological symptoms that can affect their quality of life and ability to work. Dietary modifications and food supplements may be explored by some women as alternatives to hormone replacement therapy, although existing reviews and expert position statements have given this limited consideration. This narrative review summarises the current evidence for dietary patterns, and botanical and food supplements, in the management of common menopausal symptoms, including vasomotor symptoms (VMS; hot flushes; night sweats), changes in bodyweight and composition, psychological symptoms (depression; anxiety; cognitive changes), sleep disturbances, joint pain, skin changes and urogenital symptoms. Soy isoflavones may reduce the frequency and/or severity of VMS, although results are inconsistent, and it is unclear whether dietary and supplemental sources have comparable effects.

    Observational StudyPubMedLow Quality
  • Herbal preparations for the menopause: beyond isoflavones and black cohosh.

    Depypere HT, Comhaire FH · Maturitas · 2014

    Complementary and alternative medicines (CAM) such as isoflavones and black cohosh are commonly used to deal with menopausal symptoms, but benefit a limited proportion of women. The aim of this minireview is to summarize the evidence of the efficacy and safety of other herbal preparations. Randomized controlled trials (RCTs) find that the extracts of Mediterranean pine bark (Pycnogenol(®)), linseed, and Lepididium meyenii (Maca) reduce vasomotor symptoms. The results of RCTs of the hop flavonoid 8-prenylnaringenin are conflicting. Animal and human studies suggest that Dioscorea villosa (Wild yam),and Broccoli may protect against osteoporosis and breast and gynecological cancers but further evidence is required. Linseed may protect against breast cancer but the results are conflicting.

    Observational StudyPubMedLow Quality

Clinical Trial Registries(2)

Registered ongoing or completed trials (ClinicalTrials.gov).

Moderate Quality

Limitations: Consistency across trials is lacking; some high-quality systematic reviews suggest that the benefit of black cohosh is not significantly greater than placebo in all populations. Variation in extract types, dosages, and study durations contributes to conflicting results. Additionally, many trials involve multi-ingredient formulas, making it difficult to isolate the efficacy of black cohosh alone.

This page is educational. Statements use phrases like "may support" and "has been studied for"because no remedy here is approved to cure, treat, or reverse any condition. Discussion happens on the ailment pages — community statistics here are derived from those reports. Always consult a qualified clinician.

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