Outcome
    Moderate Evidence

    Black Cohosh for Hot Flash Reduction

    Black cohosh is the most-studied herbal for hot flashes, with meta-analyses showing modest benefit over placebo in perimenopausal women.

    Overview

    Black cohosh is the most-studied herbal for hot flashes, with meta-analyses showing modest benefit over placebo in perimenopausal women.

    Verdict

    Mixed evidence

    How It Works

    Acts on serotonergic and possibly estrogen-receptor-independent pathways in the hypothalamic thermoregulatory zone, rather than as a true estrogen mimic.

    Dosing & Protocol

    Typical dose

    Recommended dose
    40–80 mg/day standardized extract (2.5% triterpene glycosides) for up to 6–12 months.
    Expected timeframe
    4-12 weeks

    Protocol

    form
    Extract standardised to 2.5% triterpene glycosides
    timing
    With food; if night sweats dominate, weight the dose toward the evening
    duration
    Up to 6-12 months, with a formal review at 12 weeks
    stop rule
    No meaningful reduction at 12 weeks means it is not working for you - stop rather than continuing indefinitely
    titration
    Increase to 40-80 mg/day, single or divided, if flushes persist
    measurement
    Log hot flush frequency and severity daily for a week before starting, and again at week 12
    starting dose
    20-40 mg standardised extract daily with food for the first two weeks

    Evidence

    What the studies say

    Meta-analyses show reduced vasomotor symptom scores versus placebo, though individual trials vary and some show no benefit. Best results in perimenopause with frequent symptoms. Rare hepatotoxicity case reports limit long-term use.

    Treatment of vasomotor symptoms of menopause with black cohosh, multibotanicals, soy, hormone therapy, or placebo: a randomized trial

    Score: 9/10
    2006
    rct
    n=351

    Newton KM, Reed SD, LaCroix AZ +3 more

    Black cohosh, multibotanical preparations and soy did not reduce vasomotor symptom frequency or intensity more than placebo at any timepoint, whereas hormone therapy did.

    View source

    Safety and Efficacy of Black Cohosh and Red Clover for the Management of Vasomotor Symptoms: A Randomized Controlled Trial

    Score: 8/10
    2009
    rct
    n=89

    Geller SE, Shulman LP, van Breemen RB +10 more

    Neither red clover nor black cohosh reduced vasomotor symptoms significantly more than placebo over 12 months, while hormone therapy did.

    View source

    Safety

    Caveats

    Avoid with liver disease; rare liver injury reported. Not for estrogen-sensitive conditions without clinician input. Less effective in surgical/early menopause.

    Less likely to help if

    Women with infrequent mild flashes; postmenopausal women years past transition.

    Medical Disclaimer

    The information provided on this website is for educational and informational purposes only and is not intended as a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition or before starting any supplement regimen.

    Individual results may vary. The statements on this website have not been evaluated by the Food and Drug Administration. Products and information are not intended to diagnose, treat, cure, or prevent any disease.