Herb ·Moderate evidence ·Reviewed May 2026
North American herb used for menopause symptom relief, especially hot flashes.
The bottom line
Evidence rating moderate. Most-documented uses: hot flash relief, menopause support, mood during menopause. 17 sources indexed (2008–2026), with 6 interaction records on file.
Core mechanism
Triterpene glycosides (actein, cimicifugoside) modulate serotonin receptors and opioid receptors. Does NOT directly affect estrogen levels despite common belief. Reduces LH surges.12
Take with food; effects seen in 4-8 weeks13
Dosing protocol
Rare hepatotoxicity reports; monitor ALT in long-term use. Effect builds over 8-12 weeks.13
Ranked by evidence and value.
Real-world pricing across three quality tiers. Assumes Standardized Black Cohosh Extract.
Assumes 20-40 mg/day. Vendor basis: NOW/iHerb, Vitacost, Life Extension, and Amazon marketplace; branded Remifemin-style extracts sit higher. Updated 2026-05-28.
How much you'd eat to match a supplemental dose.
Black cohosh is a medicinal root extract and is not a culinary food with comparable triterpene glycoside dosing.
What to test, the optimal window inside the conventional range, and how long a response takes.
Cimicifuga racemosa (40 to 80 mg per day of standardized extract) reduces hot flash frequency and intensity modestly in menopausal women; mechanism is not estrogenic.4,5
Rare case reports of hepatotoxicity; monitor ALT/AST in long-term use. Does not alter estradiol, FSH, or LH; do not interpret hormonal labs as a response marker.
Where this appears in the symptom-to-supplement map, ranked by relevance.
Standardized black cohosh extracts reduce hot flash frequency and intensity in menopausal women through a non-estrogenic mechanism.2,1
Effect builds over 8 to 12 weeks. Rare hepatotoxicity reports; pair with periodic ALT if used long-term.
May act on serotonergic and possibly central thermoregulatory pathways rather than as a direct estrogen, which could modestly ease vasomotor symptoms such as hot flashes.2,3
Avoid in active liver disease and consider baseline liver function testing if used long term.
Black cohosh is used for menopausal symptoms and may ease vasomotor complaints, with weaker and inconsistent effects on local dryness.2,3
Rare liver reactions are reported; stop and see a clinician if you notice jaundice or upper abdominal pain.
Evidence-based stacks that include it, with the exact dose and timing each one uses.
Black Cohosh is a botanical used to ease hot flashes and night sweats during the menopausal transition. Its mechanism is incompletely understood and may involve serotonergic and central nervous system pathways rather than direct estrogenic action. Rare reports of liver injury exist, so discontinue and seek medical advice if signs of liver trouble appear, such as unusual fatigue, abdominal pain, dark urine, or yellowing of the skin or eyes.2,1
Both herbs carry independent hepatic safety signals, so combining them can complicate monitoring and attribution if liver enzymes rise or symptoms of liver injury appear.
Recommendation: Avoid routine co-use. If both are taken, watch for signs of liver injury (fatigue, dark urine, jaundice, right upper quadrant pain) and consider baseline and periodic liver function tests.
Pairing black cohosh for menopausal vasomotor symptoms with vitamin D3 addresses a complementary need, since postmenopausal women face elevated bone loss risk that adequate vitamin D helps mitigate.
Recommendation: Reasonable to combine for menopausal women; ensure vitamin D intake supports bone health alongside symptom relief from black cohosh. No timing precautions needed.
Calcium complements black cohosh in the menopausal setting by supporting bone density, which black cohosh does not address while it relieves vasomotor symptoms.
Recommendation: Suitable to combine for postmenopausal bone and symptom support. Take calcium with food in divided doses for best absorption.
Concentrated Green Tea Extract is one of the botanicals most consistently linked to liver injury in the US Drug-Induced Liver Injury Network, and Black Cohosh has also been reported (though with weaker, more disputed causality). Taking them together means simultaneously exposing the liver to two agents that have each been associated with hepatitis, cholestasis, or, rarely, acute liver failure. Reported latency for either ranges from a few weeks to several months. The combined risk is most relevant in people who also drink alcohol, take other hepatotoxic agents, fast before dosing, or have pre-existing liver disease.
Recommendation: Avoid routinely stacking standardized Black Cohosh with high-dose Green Tea Extract (especially EGCG concentrates taken on an empty stomach). If both are used, keep each within label doses, take Green Tea Extract with food, limit alcohol, and consider baseline plus periodic liver enzymes (ALT, AST, bilirubin) at roughly 4 to 8 weeks. Stop both immediately and seek care for dark urine, jaundice, right upper quadrant pain, nausea, or unexplained fatigue. Prefer brewed green tea over concentrated extract if hepatotoxic stacking is a concern.
On their own, supplemental 5-HTP can already raise serotonin levels, and Black Cohosh has measurable serotonergic pharmacology plus at least one published case of serotonin toxicity when taken alongside serotonergic prescription drugs. Layering 5-HTP on top of Black Cohosh theoretically pushes serotonergic signaling higher. Excess serotonergic activity can present as agitation, sweating, tremor, rapid heartbeat, gastrointestinal upset, and in severe cases the cluster of features seen in serotonin syndrome.
Recommendation: Do not combine 5-HTP with Black Cohosh if you also take any SSRI, SNRI, MAOI, tramadol, triptan, or other serotonergic medication. If using both supplements alone, start 5-HTP low (for example 50 mg) and avoid stacking near full doses of both. Watch for restlessness, shivering, sweating, fast heart rate, muscle twitching, or confusion, and stop both and seek care if these appear. People with a prior serotonergic reaction should avoid the pairing.
Black cohosh (Cimicifuga racemosa) is used for menopausal symptoms and has mild estrogenic and serotonergic activity. Combining it with prescribed estradiol is rarely necessary and complicates side-effect attribution, including for rare liver-injury cases reported with black cohosh.
Recommendation: If you are already on prescribed estradiol for menopausal symptoms, adding black cohosh is generally not needed. If you decide to combine them, do so under clinician supervision and watch for jaundice, dark urine, or abdominal pain (signs of liver injury). Stop and seek care if these occur.
Numbered references. Citations throughout the page link here.
Curtis S, Moore A, Breakspear I. Efficacy and safety of Actaea racemosa for relieving climacteric complaints. Menopause (New York, N.Y.). 2026
Black cohosh extracts significantly improved overall menopausal symptoms and hot flashes versus placebo across 22 articles including 2,310 women.
Isopropanolic black cohosh extract produced significant reduction in hot flushes, particularly in women with intense hot flushes, at 40 mg/day with improvement in mood.
Black cohosh (Cimicifuga racemosa) was among the herbal medicines that showed significant improvements in anxiety and depression scores in peri- and postmenopausal women.
Meta-analysis of five RCTs showed no evidence that isopropanolic black cohosh extract has any adverse effect on liver function.
Preparations containing black cohosh improved menopausal vasomotor symptoms by 26% overall, though with significant heterogeneity between trials.
Palacio C, Masri G, Mooradian AD. Black cohosh for the management of menopausal symptoms : a systematic review of clinical trials. Drugs & aging. 2009
Borrelli F, Ernst E. Black cohosh (Cimicifuga racemosa) for menopausal symptoms: a systematic review of its efficacy. Pharmacological research. 2008
Pokushalov E, Ponomarenko A, Garcia C et al.. Assessing the combined effects of Black Cohosh, Soy Isoflavones, and SDG Lignans on menopausal symptoms: a randomized, double-blind, placebo-controlled clinical trial. European journal of nutrition. 2025
Dernbach MR, Carpenter JE, Shah N et al.. Black Cohosh Interactions with Prescription Medications Associated with Serotonin Toxicity and Rhabdomyolysis: A Case Report. The Journal of emergency medicine. 2024
Black cohosh is effective for menopausal symptoms; most common dose is 40 mg/day achieving significant reduction in hot flushes with effects seen in 4-8 weeks.
Data do not support hepatotoxicity as causally related to black cohosh use; all case reports assigned only possible causality, none were probable or certain.
Mahady GB, Low Dog T, Barrett ML et al.. United States Pharmacopeia review of the black cohosh case reports of hepatotoxicity. Menopause (New York, N.Y.). 2008
This page is educational. Do not start, stop, or change a supplement or medication based on it without checking with a qualified healthcare professional.
Use this with your stack
Add it to your stack, see how it interacts with everything else you take, and get a Stack Score that updates the moment it does.
NutriStack is an informational and organizational tool, not a medical service, and not a substitute for professional advice. Always consult a qualified healthcare professional before starting, stopping, or changing any supplement or medication.
NutriStack