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Limited evidenceWomen's health

Wild Yam

Wild yam is sold as a "natural progesterone" alternative, and that premise is simply wrong: the human body cannot convert its diosgenin into progesterone or DHEA. The one decent controlled trial found no effect on menopausal symptoms or hormones.

What the science says

  • Relieves menopausal symptoms Limited evidence

    In a randomized, double-blind, placebo-controlled crossover trial, 23 healthy menopausal women used topical wild yam extract cream for 3 months and showed no significant difference from placebo in menopausal symptom scores, serum lipids, FSH, estradiol or progesterone. Both arms improved slightly, consistent with placebo response. No subsequent trial has contradicted this.

  • Provides a natural source of progesterone or DHEA Limited evidence

    Diosgenin is a plant sterol used as an industrial feedstock for laboratory synthesis of progesterone and DHEA — a multi-step chemical process. Humans have no enzymatic pathway to perform that conversion, and the trial above confirmed no rise in serum progesterone after topical use. Any product that genuinely raises progesterone is either delivering added USP progesterone or is not working.

  • Relieves menstrual cramps or improves libido Limited evidence

    There are no controlled human trials supporting these uses. Traditional use as an antispasmodic and the discredited hormone-precursor story do most of the selling here.

Dosage & safety

Studied doseNo effective dose has been established. The controlled trial used a topical cream containing wild yam extract applied twice daily; oral capsules on the market typically contain 400-1,000 mg of root powder or extracts standardized to 10-20% diosgenin, with no efficacy data at any dose.
SafetyOral wild yam in modest amounts is generally well tolerated; large doses cause nausea, vomiting and diarrhea, and raw Dioscorea species contain saponins that are irritant. The main practical hazard is adulteration: "natural progesterone" creams sold as wild yam have repeatedly been found to contain undeclared pharmaceutical progesterone or other hormones, which can cause real endocrine effects and cannot be dosed safely without medical supervision. Avoid in pregnancy and breastfeeding. Do not use wild yam as a substitute for prescribed progesterone in endometrial protection during estrogen therapy — that is a genuine safety risk, not just wasted money.

Scientific references

Where to buy

Solaray, Vital Extracts, Wild Yam, 60 VegCaps

View on iHerb

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