Wild Yam (Dioscorea villosa): Traditional Uses & Safety

At a glance

Botanical name: Dioscorea villosa
Family: Dioscoreaceae
Part used: Root
Taste: Bitter
Temperature: Cool
Moisture: Moist

No pre-1900 source found for this exact plant. The one old reading describes the Chinese yam, a different species from the American wild yam this entry is about.

Safety at a glance

In pregnancy

Insufficient data; avoid

While breastfeeding

Insufficient data; avoid during breastfeeding as precaution.

For children

Avoid under 12

Cautions

Diosgenin does NOT convert to progesterone in the body (common misconception)

General contraindications

Insufficient safety data; avoid (antispasmodic activity)

Stewardship

Wild Yam (Dioscorea villosa) wild populations declining from over-harvest for synthetic steroid precursor industry. Choose sustainably cultivated. Stewardship: the plant that launched the birth-control pill industry teaches that herbal medicine is not disconnected from pharmaceutical history.

In the traditional record

Wild Yam (Dioscorea villosa) — known among Eclectic physicians as "colic root" and documented in King's American Dispensatory for biliary colic, dysmenorrhea, and spasmodic abdominal pain; the genus name honors Dioscorides, the 1st-century Greek physician and author of De Materia Medica.

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Educational use

The Apothecary is educational and does not constitute medical advice. Nothing here is intended to diagnose, treat, cure, or prevent any disease. Always consult a qualified healthcare provider before changing what you take, especially if you are pregnant, nursing, taking medication, or managing a diagnosed condition.

On our sources

These entries draw on public-domain materia medica, most of it published before 1900, alongside a smaller number of modern reference works. Energetic qualities such as warming, cooling, drying and moistening are a traditional framework for describing how a plant behaves in the body, not a laboratory measurement. Where a period source states one, we cite it. Where none does, and for many North American herbs none exists, the value reflects modern herbal consensus rather than a historical text. When we cannot support a caution with real evidence, we say nothing rather than guess.