Wild Yam

Pronunciation: dy-oh-SKOR-ee-uh vil-OH-suh.

Generic name
Dioscorea villosa (wild yam root)
Drug class
Herbal/dietary supplement (Dioscoreaceae family plant root) -- not a licensed medicine
Form
Capsule, tablet, powder, liquid extract, or topical cream, in widely varying, manufacturer-determined concentrations
Route
Oral (capsule, tablet, powder) or topical (cream)
Legal status
Available over-the-counter as a dietary/herbal supplement or cosmetic ingredient in all 6 markets reviewed; not a prescription or licensed OTC medicine, and not a UK-THR-registered or EU-HMPC-recognised herbal medicine, anywhere

Availability and supply rules vary by country

Trade names by country: United States · United Kingdom · Canada · Australia · New Zealand

Australia: MediHerb Wild Yam Complex (ARTG 381295) (6), Wild yam cream (e.g. AUST L 345273) (6) · Full directory

What Dioscorea villosa (wild yam root) is and how it works

Wild yam is the dried root of Dioscorea villosa, an herbal/dietary supplement sold as capsules, tablets, and topical creams. It is not an approved medicine anywhere -- it has no FDA, MHRA, EMA, Health Canada, TGA, or Medsafe drug approval for treating or preventing any disease. (1) (2)

Wild yam is often marketed for menopause symptoms, PMS, and menstrual cramps, sometimes with claims that it works as a 'natural' source of progesterone or DHEA. This claim is not accurate: wild yam contains a plant compound called diosgenin, which CAN be converted into progesterone, DHEA, and other steroid hormones -- but only through a multi-step chemical process in a laboratory, historically used to manufacture the first mass-produced steroid hormone medicines. The human body has no way to perform this conversion, so taking wild yam does not raise your body's own progesterone, DHEA, or oestrogen levels. Where a product is labelled 'wild yam and progesterone,' the progesterone in it was added separately during manufacturing, not produced from the wild yam itself.

Mechanism of action: how Dioscorea villosa (wild yam root) works

Wild yam root contains diosgenin and related steroidal saponins. Diosgenin is the historical industrial starting material for the multi-step chemical (Marker degradation-derived) synthesis of progesterone, DHEA, cortisone, and other steroid hormones -- a laboratory process, not a reaction the human digestive system or metabolism can perform. Diosgenin does not bind the human progesterone or oestrogen receptor in vitro, and has not been shown to raise DHEA levels or induce steroidogenesis in human studies. Any genuine hormonal ingredient found in a 'wild yam' branded product (e.g. a 'wild yam and progesterone' cream) reflects a separately added ingredient, not in-body conversion. (1)

What Dioscorea villosa (wild yam root) is used for

Traditional/marketed use for menopause and menstrual symptoms (not a proven or approved treatment)

Wild yam is traditionally used and marketed for menopause symptoms, vaginal dryness, PMS, and menstrual cramps. In Australia, TGA-listed (AUST L) wild yam products may carry pre-approved traditional-use wording to this effect, but AUST L listing does not involve any TGA assessment of efficacy evidence. These are traditional/marketed uses, not medically proven or regulator-approved treatments, and should not be relied on in place of discussing symptoms with a clinician. (1) (6)

Other traditional/marketed uses (osteoporosis prevention, low libido, gallbladder pain, rheumatoid arthritis, diverticulosis)

Wild yam is also marketed for osteoporosis prevention, increased sexual desire, gallbladder pain, rheumatoid arthritis, and diverticulosis. None of these uses have the same evidentiary backing as an approved medicine in any market reviewed. (1)

Before taking Dioscorea villosa (wild yam root)

Do not take / not appropriate for

  • Use particular caution, and discuss with a clinician first, if you have a hormone-sensitive cancer (breast, uterine, or ovarian), endometriosis, or uterine fibroids. (all countries) (1)
  • Not enough safety data exists to recommend use during pregnancy or while breastfeeding. (all countries) (1)

Tell your clinician about

  • Whether you have, or have had, a hormone-sensitive cancer, endometriosis, or uterine fibroids.
  • Whether you are pregnant, breastfeeding, or considering giving a supplement to a child.
  • Whether you take oestrogen-containing medicines (such as hormone therapy or some contraceptives), since wild yam may reduce their effectiveness.
  • Whether you have a diagnosed clotting disorder such as protein S deficiency, since there is a case report of a clotting event (retinal vein thrombosis) associated with use.
  • That you are taking wild yam at all, since it is a supplement your clinician may not otherwise know about.
(1)

How to take Dioscorea villosa (wild yam root)

  • Wild yam is a supplement, not a prescribed medicine -- there is no single regulator-approved dose for any specific health condition.
  • Follow the manufacturer's label directions and discuss the appropriate use, if any, with your clinician or pharmacist, especially if you have a hormone-sensitive condition or take other medicines.
  • Because supplement strength and purity are not independently verified to the same standard as a licensed medicine in any of the 6 markets reviewed, actual diosgenin/wild yam content can vary between brands and batches.
  • Do not use wild yam as a substitute for prescribed hormone therapy without discussing this with your clinician first -- it does not provide the same hormone effect.
(1) (5)

Procedures and treatment changes

Tell the treating team before surgery, procedures, or any medicine change. Do not alter treatment without the responsible clinician. (1) (2) (3) (4) (5) (6) (7)

Missed dose

As a supplement without a prescribed treatment schedule, there is no clinical guidance to give for a missed dose. If you are taking wild yam as part of a specific plan discussed with a clinician, follow their advice.

Overdose

There is no regulator-defined overdose threshold for wild yam as there would be for a licensed medicine. Large oral amounts have been associated with vomiting. Seek medical advice if you experience concerning symptoms after taking a large amount of any supplement. (1)

Side effects

Side effects and their urgency vary; report severe, persistent, or concerning symptoms.

Generally described as possibly safe in typical amounts when taken orally or applied topically.

What to notice: Generally described as possibly safe in typical amounts when taken orally or applied topically.

What to do: Discuss persistent or troublesome symptoms with the treating clinician or pharmacist. (1)

Vomiting has been reported with large oral amounts.

What to notice: Vomiting has been reported with large oral amounts.

What to do: Discuss persistent or troublesome symptoms with the treating clinician or pharmacist. (1)

Serious warnings

History of, or current, hormone-sensitive cancer, endometriosis, or uterine fibroids — high caution

Symptoms: No new symptom needs to appear for this caution to matter -- it applies to anyone with this history considering wild yam.

Action: Discuss with a clinician or oncology team before using wild yam, given its claimed (though not body-converted) hormone-related activity and the theoretical concern this raises for hormone-sensitive conditions. (1)

Signs of a blood clot (e.g. sudden vision changes, calf swelling and pain, chest pain, shortness of breath) — emergency

Symptoms: Sudden vision loss or changes in one eye, painful swelling in one leg, chest pain, or shortness of breath.

Action: Seek emergency medical help immediately. A case report has linked wild yam use to a retinal vein clot, and there is theoretical concern in people with a clotting disorder such as protein S deficiency. (1)

Reduced effectiveness of oestrogen-containing medicines — moderate caution

Symptoms: Breakthrough symptoms your oestrogen-containing medicine (such as hormone therapy or a contraceptive) was controlling.

Action: Tell your clinician you are using wild yam if you take an oestrogen-containing medicine, since wild yam may reduce its effectiveness. (1)

Interactions

  • Oestrogen-containing medicines (hormone therapy, some contraceptives): wild yam may reduce their effectiveness -- a moderate-level interaction. (1)

Pregnancy, breastfeeding, kidney/liver function, age

Pregnancy

Not enough safety data exists to recommend use during pregnancy; discuss with a clinician before using any supplement while pregnant. (1) (2) (3) (4) (5) (6) (7)

Breastfeeding

Not enough safety data exists to recommend use while breastfeeding; discuss with a clinician first. (1) (2) (3) (4) (5) (6) (7)

Children

No regulator dosing or safety guidance was identified for children in any of the 6 markets reviewed. (1) (2) (3) (4) (5) (6) (7)

Monitoring

Before starting

  • Discussion with a clinician if you have a hormone-sensitive cancer, endometriosis, uterine fibroids, a clotting disorder, or if pregnant/breastfeeding
  • Review of any oestrogen-containing medicines you take

During treatment

  • Watch for any new vision changes, leg swelling/pain, chest pain, or shortness of breath.
  • Report any breakthrough symptoms from an oestrogen-containing medicine to your clinician.
(1)

Storage

Store according to the product label; as with any supplement, keep out of reach of children and check the expiry date.

Professional information

Clinician-facing context only. Wild yam is a dietary/herbal supplement, not an approved medicine, in every market reviewed; no regulator-approved prescribing information exists to cite. Content here reflects the professional pharmacology-reference literature reviewed for this dossier.

Canada

Indication: Topical/cosmetic use (Health Canada NHPID entry)

Dose summary: The specific NHPID entry identified caps purity at <=3.5% diosgenin and <=0.4% glycosides/steroidal saponins for non-medicinal, skin-conditioning topical use.

Renal context: Not addressed in the sources reviewed. (5)

Mechanism of action

Hepatic guidance

No specific hepatic-impairment guidance identified in the sources reviewed.

Overdose note

No established medicine-level overdose threshold or antidote; large oral amounts have been associated with vomiting, and management of any concerning symptoms would be supportive. (1)

Frequently asked questions

Does wild yam turn into progesterone or DHEA in the body?

No. This is a common but inaccurate marketing claim. Wild yam contains diosgenin, a plant compound that CAN be converted into progesterone, DHEA, and other steroid hormones -- but only through a multi-step chemical process carried out in a laboratory, historically used to manufacture the first mass-produced steroid hormone medicines. The human body has no pathway to perform this conversion, so taking wild yam does not raise your body's own progesterone, DHEA, or oestrogen levels. (1)

Is wild yam FDA-approved or a real medicine?

No. Wild yam is sold as a dietary/herbal supplement or cosmetic ingredient in the United States and every other market reviewed for this page (UK, EU, Canada, Australia, New Zealand). It does not have FDA drug approval, an EMA/MHRA marketing authorisation, or any equivalent medicine-level approval anywhere. (2) (1)

What does a 'wild yam and progesterone' product actually contain?

If a product genuinely lists progesterone as an ingredient, that progesterone was added separately during manufacturing -- it is not something your body produces from the wild yam component after use. Always check the actual ingredient list rather than assuming the name implies in-body conversion. (2)

Is wild yam regulated the same way in every country?

No -- oversight varies genuinely by country, and in some cases is quite limited. Australia's 'Listed' (AUST L) pathway lets the sponsor self-certify compliance, without the TGA independently evaluating efficacy. Health Canada's own ingredient database designates one wild yam root extract entry as non-medicinal/cosmetic-only. No dedicated UK Traditional Herbal Registration product or EU HMPC herbal monograph was found for wild yam. The US and New Zealand frameworks reviewed do not require ingredient-specific pre-market efficacy review either. (6) (5) (3) (4)

What is the mechanism of action of Dioscorea villosa (wild yam root)?

Wild yam root contains diosgenin and related steroidal saponins. Diosgenin is the historical industrial starting material for the multi-step chemical (Marker degradation-derived) synthesis of progesterone, DHEA, cortisone, and other steroid hormones -- a laboratory process, not a reaction the human digestive system or metabolism can perform. Diosgenin does not bind the human progesterone or oestrogen receptor in vitro, and has not been shown to raise DHEA levels or induce steroidogenesis in human studies. Any genuine hormonal ingredient found in a 'wild yam' branded product (e.g. a 'wild yam and progesterone' cream) reflects a separately added ingredient, not in-body conversion. (1)

What is the generic name of Wild Yam?

The generic name is Dioscorea villosa (wild yam root). (1) (2) (5)

What class of drug is Dioscorea villosa (wild yam root)?

Wild Yam is classed as: Herbal/dietary supplement (Dioscoreaceae family plant root) -- not a licensed medicine. (1) (2) (5)

References

  1. Wild Yam: Uses, Side Effects, Interactions, Dosage, and WarningRxList (summarising the Natural Medicines Comprehensive Database, a widely used professional pharmacology reference for herbal/dietary supplements) · United States · accessed 2026-07-31 · source 1
  2. Multiple wild yam cream / wild yam and progesterone structured product labelsU.S. National Library of Medicine / DailyMed -- structured product labels for wild-yam-containing OTC/topical products · United States · accessed 2026-07-31 · source 2
  3. Traditional Herbal Registration (THR) scheme -- no dedicated wild yam/Dioscorea villosa THR product identifiedMedicines and Healthcare products Regulatory Agency (MHRA), United Kingdom -- Traditional Herbal Registration (THR) scheme · United Kingdom · accessed 2026-07-31 · source 3
  4. No EMA/HMPC Community herbal monograph identified for Dioscorea villosa (wild yam)European Medicines Agency (EMA) -- Committee on Herbal Medicinal Products (HMPC) · European Union · accessed 2026-07-31 · source 4
  5. Dioscorea villosa (Wild Yam) Root Extract -- NHPID ingredient entry (id 16155)Health Canada -- Natural Health Products Ingredients Database (NHPID) · Canada · accessed 2026-07-31 · source 5
  6. MediHerb Wild Yam Complex (ARTG 381295) and other AUST L Listed wild yam complementary medicinesTherapeutic Goods Administration (TGA), Australia -- Australian Register of Therapeutic Goods (ARTG) · Australia · accessed 2026-07-31 · source 6
  7. Regulation of dietary supplements in New Zealand (Dietary Supplements Regulations 1985)Medsafe (New Zealand regulator) -- Dietary Supplements Regulations 1985 · New Zealand · accessed 2026-07-31 · source 7

Brand names by country

Single-ingredient Dioscorea villosa (wild yam root) names are shown separately by country. Product availability, strengths, and supply rules can change; combination products are not included here.

Priority countries

United States

  • Multiple dietary-supplement brands (capsule/tablet) and topical creams (2)DSHEA regulated no FDA efficacy review · variable, unregulated concentrations across brands · various dietary supplement and OTC cosmetic manufacturers

United Kingdom

  • Multiple food-supplement/cosmetic brands (3)no dedicated MHRA THR registration identified cannot carry medical claims · variable across brands · various food-supplement/cosmetic manufacturers

Canada

  • Dioscorea villosa (Wild Yam) Root Extract -- topical/cosmetic use (5)Health Canada NHPID non medicinal skin conditioning ingredient · <=3.5% diosgenin, <=0.4% glycosides/steroidal saponins purity cap · various

Australia

  • MediHerb Wild Yam Complex (ARTG 381295) (6)TGA Listed AUST L active · not fully specified in source · MediHerb
  • Wild yam cream (e.g. AUST L 345273) (6)TGA Listed AUST L active · not fully specified in source · various

New Zealand

  • Multiple dietary supplement brands (7)no Medsafe preapproval process sponsor self certified · not fully specified in source · various dietary supplement sponsors
View brands in additional countries.

European Union

Multiple food-supplement brands (per member state) (4)

This page provides general reference information about wild yam, a dietary/herbal supplement, and is not a substitute for advice from your clinician. Wild yam is not an approved medicine for treating or preventing any disease in any market reviewed, and does not convert to progesterone, DHEA, or oestrogen in the human body. Always tell your clinician or pharmacist about any supplement you take, especially if you take other medicines or have a hormone-sensitive condition.

Related medicines

Related conditions