Hyacinth bean

Botanical

What is it

Hyacinth bean (Lablab purpureus, also Dolichos lablab, Bai Bian Dou in Chinese) is a legume cultivated for food and used in traditional Chinese and Ayurvedic medicine for digestive complaints. Note: the term hyacinth bean is also sometimes confused with hyacinth orchid (Bletilla striata), which is a different plant.

Evidence for 1 use

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

Digestive support (TCM use)

Mixed Evidence

Traditional Chinese medicine use is well-documented; modern clinical evidence is limited.

How it works

Hyacinth bean seeds contain protein, fiber, and various phytochemicals including flavonoids and trypsin inhibitors. Raw beans contain toxic cyanogenic glycosides and lectins that must be destroyed by thorough cooking. In traditional Chinese medicine, properly prepared Bai Bian Dou is used for diarrhea, summer heat-induced GI complaints, and as a spleen-strengthening (digestive) herb. Modern pharmacological data are limited.

Dosage

TCM traditional: 9-30 g of cooked seed in formulas. Avoid raw consumption.

When and how to take it

Traditional TCM formulations follow practitioner protocols.

2 commercial forms

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

Cooked seed (Bai Bian Dou)

Used in TCM formulas.

Cooking destroys toxins

Standardized extract

Capsule form.

Variable

Safety

Raw hyacinth beans are toxic due to cyanogenic glycosides and require thorough cooking. Properly prepared seeds are generally safe. Some individuals may experience GI upset.

Who should be cautious

Never consume raw hyacinth beans. Avoid in pregnancy without TCM practitioner guidance. Caution with allergies to legumes.

Interactions

Limited interaction data.

Food sources

Hyacinth bean (cooked)

Amount
Variable
%DV
—

Frequently asked questions

Can I eat raw hyacinth beans?⌄

No. Raw beans contain cyanogenic glycosides and must be thoroughly cooked.

Is hyacinth bean the same as hyacinth orchid?⌄

No, these are different plants. Hyacinth bean is Lablab purpureus (a legume), and hyacinth orchid is Bletilla striata (an orchid used in TCM for different purposes).

References

Hyacinth bean on Wikidata — Wikidata link

Hyacinth bean on NIH DSLD (US supplement label database) — NIH Dietary Supplement Label Database link

Research on Hyacinth bean (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.