Dioscorea nipponica

Botanical

What is it

Dioscorea nipponica Makino is a yam species native to East Asia, used in traditional Chinese medicine as 'chuan shan long' for what TCM describes as activating circulation and resolving phlegm. It is also a commercial source of diosgenin used in the steroidal sapogenin industry.

Evidence for 1 use

AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.

Joint and cardiovascular conditions (traditional Chinese use)

Mixed Evidence

Chinese clinical reports describe benefits but rigorous controlled trials are sparse.

How it works

The rhizome is rich in steroidal saponins (dioscin) and the aglycone diosgenin. Diosgenin is a starting material for industrial synthesis of progesterone and other steroid hormones, but it is not converted to hormones in the human body. In cell and animal studies, dioscin and related saponins show anti-inflammatory, lipid-lowering, and cardioprotective activity. Some Chinese clinical reports describe benefits in cardiovascular and joint conditions. Rigorous English-language clinical trials are limited.

Dosage

Traditional decoction doses are 6–15 g. Standardized extracts at higher concentration may use lower amounts. DSLD label data is limited.

When and how to take it

Traditional decoction multiple times daily.

1 commercial form

Compare the main delivery options and what they’re best suited for.

Rhizome extract (concentrated)

Traditional and commercial form.

Saponin absorption variable.

Safety

Traditional use is generally tolerated. Dioscin has saponin activity that can cause GI upset at higher doses. Long-term safety of concentrated extracts not well established.

Who should be cautious

Avoid in pregnancy and breastfeeding due to absent data. Diosgenin does not 'turn into' progesterone in the body, so it is not a substitute for hormone therapy.

Interactions

Possible interactions with anticoagulants and lipid-lowering drugs based on preclinical data; clinical relevance not established.

Frequently asked questions

Does this contain progesterone?⌄

No. It contains diosgenin, an industrial precursor for steroid synthesis, but the human body does not convert diosgenin to hormones.

References

Dioscorea nipponica on Wikidata — Wikidata link

Dioscorea nipponica on NIH DSLD (US supplement label database) — NIH Dietary Supplement Label Database link

Research on Dioscorea nipponica (PubMed search) — PubMed link

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Evidence-based·How we grade evidence

Disclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you’re pregnant, breastfeeding, on medications, or managing a chronic condition.