Black cohosh menopause supplements are increasingly popular among women seeking natural relief, but does the evidence support their use? A 2016 UK survey found women aged 45 to 65 experienced an average of seven different menopausal symptoms25. 42% reported symptoms worse than expected25. Many turn to herbal options such as black cohosh for menopause relief. A complete Cochrane Review of 16 studies with 2027 women found insufficient evidence to support black cohosh hot flushes treatment, with no significant difference between black cohosh and placebo29. This piece examines whether black cohosh for menopause actually works and reviews UK evidence, safety considerations, and how it compares to other treatments.
Understanding black cohosh: Origins and traditional uses
What is Actaea racemosa (Cimicifuga)?
Actaea racemosa, commonly known as black cohosh, is a perennial flowering plant belonging to the buttercup family (Ranunculaceae)1. The plant carries several other names, including black snakeroot, black bugbane, rattleroot, and rattleweed10. Black cohosh grows wild in eastern North America, from southern Ontario down to central Georgia and extends west to Missouri, Arkansas, and Indiana33.
The plant reaches heights of approximately 1.5 meters. It produces distinctive white, bottlebrush-like flower clusters above bright green divided leaves4. The roots and rhizomes (underground stems) are harvested to serve medicinal purposes, which requires digging up the whole plant510.
Historical use by Native Americans
Black cohosh holds a rich history in traditional medicine. Native American tribes, including the Cherokee and Iroquois, used the plant to treat a broad spectrum of conditions5. To cite an instance, it served as a treatment for gynecological problems and menstrual irregularities. It also helped ease sluggish labor during childbirth32. Native Americans applied black cohosh beyond reproductive health to treat musculoskeletal pain, rheumatism, fever, cough, pneumonia, kidney ailments, malaria, and sore throat1230.
The plant appeared in the U.S. Pharmacopeia under the name 'black snakeroot' during 18303. Practitioners used the root in the 19th century to treat snakebite, inflamed lungs, and pain from childbirth3. Native American medicine also valued black cohosh as an antidote to rattlesnake venom and applied it as a root poultice7.
How black cohosh became popular for menopause
European settlers observed Native American practices and adopted black cohosh use. They subsequently exported the herb to Europe as early as the 18th century2. European eclectic physicians integrated the plant into their treatments thereafter2. The change toward menopause treatment gained momentum over the following centuries.
Europeans have used black cohosh for menopausal symptoms for over 50 years32. The Commission E in Germany approved black cohosh for dysmenorrhea and menopausal symptoms including hot flushes, heart palpitations, nervousness, irritability, sleep disturbances, tinnitus, vertigo, perspiration, and depression2. Black cohosh was among the 15 top-selling herbal dietary supplements in the United States in 20192. It ranked as one of the five top-selling over-the-counter herbal remedies in the United States in 20135.
Available forms: tablets, extracts, and gummies
Black cohosh preparations are made from the plant's roots and rhizomes10. Consumers can purchase it as a dietary supplement in multiple formats: powdered whole herb, liquid extracts, dried extracts in pill form, tablets, and gummies1023. The most commonly used clinical preparations, such as Remifemin and BNO 1055, are made from hydroalcoholic extracts2. Some women brew dried and crushed black cohosh as a tea, though this remains less common than other [menopause supplements](https://goldmanlaboratories.com/blogs/blog/menopause-supplements)8.
The science behind black cohosh for menopause
How black cohosh is claimed to work
Scientists don't fully understand how black cohosh affects symptoms of menopause. Researchers originally believed the herb might function through estrogen-like activity, but later investigations moved this view. Most current evidence suggests black cohosh works through brain-related mechanisms rather than hormonal pathways.
Black cohosh appears to interact with multiple neurotransmitter systems. Research demonstrates effects on serotonergic pathways, with the herb binding to eight different serotonin receptor subtypes31. The compound shows strong activity on 5-HT7 and 5-HT1A receptors, both found in the hypothalamus and involved in temperature regulation31. This serotonergic mechanism may explain relief from hot flushes without affecting hormone levels.
The herb also has dopaminergic, noradrenergic, and GABAergic effects32. Some studies indicate black cohosh may influence the endogenous opioid system, with positron emission tomography imaging showing selective µ-opioid receptor availability in brain regions responsible for emotional processing2. Black cohosh treatment combined with naloxone blockade suppresses luteinizing hormone activity and supports an opioid-related mechanism2.
The phytoestrogen debate: does it mimic estrogen?
The question of whether black cohosh acts as a phytoestrogen has generated substantial scientific debate. Black cohosh contains plant phytoestrogens with structures like estrogen, though they differ from estradiol and do not produce similar effects23. Early investigations searching for estrogenic activity found differences between extract types. Lipophilic extracts often showed estrogenic properties, while hydroalcoholic extracts hired in most commercial products lacked such activity2.
Multiple studies demonstrate black cohosh does not affect luteinizing hormone, follicle-stimulating hormone, prolactin, or estradiol levels322. The herb shows no effect on breast tissue proliferation and may inhibit cell growth through inducing apoptosis31. Black cohosh does not induce estrogen-responsive genes in mammalian cells31. But one study found it may act as a selective estrogen receptor modulator in bone tissue and potentially offer benefits without risks in reproductive tissues32.
UK clinical trials and findings
Clinical trials conducted in Europe have produced mixed results for menopause treatment with black cohosh. A review of European medicinal preparations found improvements in hot flushes and menopausal symptoms compared to placebo. A newer meta-analysis determined that isopropanolic black cohosh extract, common in the EU as non-hormonal therapy, showed comparable effectiveness to low-dose transdermal estradiol32.
One randomized trial assigned 88 perimenopausal women experiencing at least 35 hot flushes and night sweats per week to receive 128 mg black cohosh, red clover, hormone therapy, or placebo. Vasomotor symptoms declined in all groups after 12 months, but no statistically significant differences emerged between black cohosh and placebo10.
Cochrane Review: insufficient evidence explained
The 2012 Cochrane Review assessed 16 randomized clinical trials with 2027 perimenopausal or postmenopausal women1033. Studies hired oral black cohosh at a median dose of 40 mg per day for a mean duration of 23 weeks109. The review found no significant difference between black cohosh and placebo in hot flush frequency (mean difference 0.07 flushes per day) or menopausal symptom scores109. Note that hormone therapy substantially outperformed black cohosh in reducing symptoms109. The authors concluded insufficient evidence existed to support or oppose black cohosh use for menopausal symptoms10.
Why study results vary so much
Variability in research outcomes stems from multiple factors. Black cohosh formulations differ in chemical composition, with active ingredients and mechanisms remaining unknown10. Studies have hired different amounts from various sources and ranged from 6.5 mg to 160 mg per day15. Researchers hired different black cohosh preparations, extraction methods (60% ethanol versus 40% isopropanol), and standardization protocols31. One analysis found variability in triterpene glycosides among 11 products31. The frequent adulteration of black cohosh with Asian Actaea species containing different phytoconstituents may explain some reported adverse effects2. Studies also had different goals and outcome measures, which makes direct comparisons difficult15.
Black cohosh effectiveness: Which symptoms might improve?
Hot flushes: what the evidence really says
Research on black cohosh for hot flushes presents contradictory findings. The Cochrane Review found no major difference between black cohosh and placebo in hot flush frequency, with a mean difference of just 0.07 flushes per day34. A 2006 trial assigned 351 women to receive 160 mg daily black cohosh and found no difference in vasomotor symptom intensity at 3, 6, and 12 months compared to placebo10. Another 2009 study with 88 perimenopausal women showed worse symptom intensity in the black cohosh group at 6 and 9 months10.
But some European studies report modest benefits. A 2016 meta-analysis of four trials found no major associations between black cohosh supplementation and reduction in vasomotor symptoms10. The North American Menopause Society advises against recommending herbal remedies like black cohosh because they are unlikely to be beneficial for vasomotor symptoms of menopause10.
Night sweats and sleep disturbances
Evidence for sleep improvement looks more promising than for hot flushes. A randomized, double-blind trial with 42 postmenopausal women aged 45-60 years found black cohosh treatment led to major polysomnographic changes. Sleep efficiency increased and wake after sleep onset duration decreased11. The black cohosh group reduced WASO duration by 15.8%11. Participants showed improved physical domains of life quality compared with placebo11.
Research suggests black cohosh may affect neurotransmitters that modulate sleep regulation, like serotonin13. Women taking black cohosh reported fewer night sweats during sleep, which potentially contributed to better rest6.
Mood changes and anxiety
Black cohosh reduced depression and anxiety by a lot in all studies reviewed in one analysis14. A review of 35 studies found the herb improved symptoms like concentration and fatigue6. Yet another larger review concluded black cohosh did not have a notable effect on anxiety9. These discrepancies may stem from different black cohosh supplements that contain varying active ingredients in different amounts9.
Symptoms black cohosh won't help
The Cochrane Review found insufficient data to pool results for vulvovaginal atrophic symptoms34. Black cohosh shows no effect on vaginal dryness, bone health, or osteoporosis prevention6. The herb does not regulate periods, ease PMS symptoms, or help arthritis pain6. Women seeking menopause treatment for these concerns should explore HRT alternatives or other natural remedies for menopause.
Taking black cohosh: Practical guidance for UK users
Image Source: Amazon UK
Recommended brands with standardized extracts
Women thinking about menopause supplements should select products standardized to contain at least 1 mg triterpene glycosides per daily dose10. Look for the Traditional Herbal Registration (THR) logo on packaging. This indicates the product has undergone quality and safety testing15. Remifemin remains the most studied commercial preparation and is standardized to 40 mg black cohosh root per daily dose of two tablets10.
Dosage guidelines: 40-80mg explained
The recommended black cohosh dose ranges from 40 to 80 mg daily based on clinical use. This is often divided into two doses to manage symptoms of menopause16. Each tablet should contain 2.5% triterpene glycosides, calculated as 27-deoxyactein17. Some formulations recommend taking one capsule twice daily—one in the morning and one in the evening17.
Timeline: when to expect results
Therapeutic effects begin after 2 weeks of treatment generally. Maximum effects occur within 8 weeks16. Studies indicate women experience symptom relief four weeks after starting supplementation. Eight weeks show more noticeable benefits18. Experts recommend using black cohosh for less than six months at a time. Long-term safety remains unknown6.
Side effects and safety profile
Most people tolerate black cohosh well. Common side effects include gastrointestinal upset and headaches. Dizziness may also occur, though these effects are mild and resolve as the body adjusts19. Other reported effects include breast pain, rash and nausea620.
Liver health concerns and MHRA warnings
The Medicines and Healthcare products Regulatory Agency (MHRA) has monitored liver reactions since 200221. The agency received 21 UK reports through March 2006. 14 cases support an association between black cohosh and hepatotoxicity21. One case required liver transplantation21. The MHRA now requires all black cohosh products to carry warnings about rare liver reactions21.
Who should not take black cohosh
Avoid black cohosh if pregnant or breastfeeding. It may increase miscarriage risk22. Women with liver disease, breast cancer or hormone-sensitive conditions should not use it1512. Those taking liver-affecting medications should also avoid it. If you have seizure disorders, kidney disease or blood clotting issues, avoid this herbal remedy6[181].
Black cohosh vs HRT and other menopause treatments
How black cohosh compares to hormone replacement therapy
Hormone replacement therapy remains the most effective evidence-based menopause treatment because it targets the mechanisms of symptoms of menopause: declining hormone levels23. HRT provides bone, heart, and neuro-protective benefits while reducing all-cause mortality by 30%23. Black cohosh for menopause shows uncertain mechanisms and inconsistent results by comparison. One scientific review found HRT alternatives more effective than black cohosh in reducing daily hot flushes and other symptoms24.
Cost comparison in the UK
Black cohosh supplements cost less than HRT prescriptions, though specific UK pricing varies by brand and formulation.
What NICE guidelines recommend
NICE acknowledges some evidence that black cohosh may affect vasomotor symptoms, yet notes uncertain quality and safety of these supplements with potential medication interactions23. The organization expresses limited evidence for herbal remedies for menopause and recommends practitioners explain these limitations before recommending natural remedies for menopause like black cohosh25.
Patient experiences and testimonials
Holland & Barrett MenoCool Black Cohosh receives 4.5 stars from 1339 customer reviews26. Drugs.com reports only 28% positive experiences, with 58% negative, however27. Cancer Research UK recommends women with breast cancer, liver problems, or high blood pressure avoid black cohosh due to insufficient research23.
Making an informed decision
Menopause supplements including black cohosh aren't tested and regulated like medicines28. Women should consult healthcare providers about HRT, red clover, sage, or soy options before selecting treatment.
Conclusion
Black cohosh is a popular choice for women seeking natural remedies for menopause, yet the evidence supporting its effectiveness is inconsistent. The most detailed reviews show no major difference between black cohosh and placebo for hot flushes, though some women report modest improvements in sleep and mood symptoms.
Before choosing black cohosh as your menopause treatment, discuss all options with your healthcare provider. This includes HRT and other herbal remedies. Your doctor can help you weigh the limited evidence against potential liver risks and determine whether black cohosh fits your health profile and symptom management needs.
Key Takeaways
Despite its popularity as a natural menopause remedy, scientific evidence reveals important limitations and considerations for black cohosh use:
• Limited effectiveness proven: Comprehensive Cochrane Review of 16 studies found no significant difference between black cohosh and placebo for hot flushes relief.
• Mixed results for symptoms: While some studies suggest modest benefits for sleep quality and mood, evidence remains inconsistent across different menopausal symptoms.
• Liver safety concerns: UK's MHRA requires warning labels due to rare but serious liver reactions, including one case requiring transplantation.
• Quality varies significantly: Black cohosh products differ widely in active ingredients and standardization, making consistent results difficult to achieve.
• HRT remains more effective: Hormone replacement therapy shows superior evidence-based results compared to black cohosh for managing menopausal symptoms.
• Consult healthcare providers first: Given uncertain benefits and potential risks, discuss all treatment options including HRT with your doctor before choosing black cohosh.
The evidence suggests that while black cohosh may offer some women mild symptom relief, it's not a proven substitute for established treatments like HRT, and safety considerations require careful medical guidance.
FAQs
Q1. Does black cohosh actually work for menopause symptoms? The evidence is mixed. A comprehensive 2012 Cochrane Review of 16 studies found no significant difference between black cohosh and placebo for hot flushes. However, a 2023 review of 22 studies suggested potential benefits for overall menopause symptoms and improvements in hot flashes, though not for anxiety or depression. Results vary considerably between studies due to differences in product quality, dosage, and extraction methods.
Q2. How long does it take for black cohosh to start working? Most women begin experiencing therapeutic effects after approximately 2 weeks of consistent use. Maximum benefits typically occur within 8 weeks of starting supplementation. Experts recommend using black cohosh for less than six months at a time, as long-term safety data remains limited.
Q3. What are the safety concerns with taking black cohosh? The UK's Medicines and Healthcare products Regulatory Agency (MHRA) requires warning labels on all black cohosh products due to rare but serious liver reactions. Common side effects include gastrointestinal upset, headaches, and dizziness. Women with liver disease, breast cancer, hormone-sensitive conditions, or those who are pregnant or breastfeeding should avoid black cohosh entirely.
Q4. What is the recommended dosage of black cohosh for menopause? The recommended daily dose ranges from 40 to 80 mg, typically divided into two doses taken morning and evening. Products should be standardized to contain at least 1 mg triterpene glycosides per daily dose. Look for the Traditional Herbal Registration (THR) logo to ensure quality and safety testing.
Q5. How does black cohosh compare to hormone replacement therapy (HRT)? HRT remains significantly more effective than black cohosh for managing menopause symptoms. HRT targets the underlying cause of symptoms by replacing declining hormones and provides additional bone, heart, and neuro-protective benefits. Scientific reviews show HRT is more effective than black cohosh in reducing hot flushes and other menopausal symptoms, though black cohosh may be considered by women who cannot or prefer not to use HRT.
References
[1] - https://content.ces.ncsu.edu/black-cohosh-actaea-racemosa-l
[2] - https://www.cancer.gov/about-cancer/treatment/cam/hp/black-cohosh-pdq
[3] - https://en.wikipedia.org/wiki/Actaea_racemosa
[4] - https://www.rhs.org.uk/plants/156095/actaea-racemosa/details
[5] - https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:316204-2/general-information
[6] - https://www.webmd.com/diet/supplement-guide-black-cohosh
[7] - https://www.herbalreality.com/herb/black-cohosh/
[8] - https://www.womenshealthnetwork.com/menopause-and-perimenopause/black-cohosh-for-menopause-symptom-relief/
[9] - https://thebettermenopause.com/blogs/the-better-gut-community/remedies-supplements-menopause-anxiety
[10] - https://ods.od.nih.gov/factsheets/BlackCohosh-HealthProfessional/
[11] - https://pubmed.ncbi.nlm.nih.gov/26000551/
[12] - https://www.msdmanuals.com/home/special-subjects/dietary-supplements-and-vitamins/black-cohosh
[13] - https://academic.oup.com/nutritionreviews/article/82/8/1087/7268827
[14] - https://pubmed.ncbi.nlm.nih.gov/17194961/
[15] - https://www.cancerresearchuk.org/about-cancer/treatment/complementary-alternative-therapies/individual-therapies/black-cohosh
[16] - https://www.drugs.com/npp/black-cohosh.html
[17] - https://bigvits.co.uk/now-foods-black-cohosh-root-80-mg-90-veg-capsules.html
[18] - https://ro.co/supplements/black-cohosh/
[19] - https://int.livhospital.com/black-cohosh-for-menopause-guide/
[20] - https://www.healthline.com/health/food-nutrition/black-cohosh
[21] - https://assets.publishing.service.gov.uk/media/5df7610ce5274a08f78bca34/Black_cohosh_and_liver_injury.pdf
[22] - https://www.webmd.com/vitamins/ai/ingredientmono-857/black-cohosh
[23] - https://www.drlouisenewson.co.uk/knowledge/black-cohosh-for-menopause-symptoms
[24] - https://pmc.ncbi.nlm.nih.gov/articles/PMC5868221/
[25] - https://evidence.nihr.ac.uk/alert/treatments-for-reducing-menopausal-hot-flushes-are-ranked-for-effectiveness/
[26] - https://www.hollandandbarrett.com/shop/product/holland-barrett-menocool-black-cohosh-tablets-60035288/reviews
[27] - https://www.drugs.com/comments/black-cohosh/
[28] - https://www.nhs.uk/medicines/hormone-replacement-therapy-hrt/alternatives-to-hormone-replacement-therapy-hrt/herbal-remedies-and-complementary-medicines-for-menopause-symptoms/
[29] - https://www.cochranelibrary.com/cdsr/doi/10.1002/14651858.CD007244.pub2/abstract
[30] - https://www.hollandandbarrett.com/the-health-hub/vitamins-and-supplements/herbal-licensed/what-is-black-cohosh/
[31] - https://pmc.ncbi.nlm.nih.gov/articles/PMC3046019/
[32] - https://www.mskcc.org/cancer-care/integrative-medicine/herbs/black-cohosh
[33] - https://www.cochranelibrary.com/cdsr/doi/10.1002/14651858.CD007244.pub2/full
[34] - https://www.cochrane.org/evidence/CD007244_black-cohosh-cimicifuga-spp-menopausal-symptoms
