Bauhinia purpurea

Botanical

What is it

Bauhinia purpurea (purple orchid tree, kachnar) is a flowering tree native to South and Southeast Asia. Its leaves, pods, bark, and flowers are used in Ayurvedic and traditional medicine, and the extract has been marketed in sports nutrition for purported thyroid-supportive effects.

Evidence for 2 uses

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

Thyroid and metabolic support

Mixed Evidence

Marketing is based on in vitro thyroid peroxidase activity. There is no published controlled human trial showing meaningful effects on thyroid hormones, metabolic rate, or body composition.

Anti-inflammatory and antioxidant (traditional use)

Mixed Evidence

Used in Ayurveda for skin and lymphatic conditions. Preclinical antioxidant data exist; no controlled human trials.

How it works

The plant contains flavonoids (including kaempferol and quercetin derivatives), tannins, saponins, and several proteins. In vitro work has identified a thyroid peroxidase-mimicking compound, which is the basis for marketing claims that Bauhinia purpurea extract increases thyroid hormone activity and supports metabolism. Direct human evidence for thyroid effects from oral Bauhinia purpurea supplements is essentially absent. The in vitro and animal data are limited and not a substitute for clinical trials in humans with normal thyroid function.

Dosage

No established RDA. Sports supplements typically use 100-500 mg of leaf or pod extract per day. Traditional Ayurvedic decoctions use larger amounts of crude bark or leaves. There is no defined upper limit.

When and how to take it

Most products are taken once or twice daily with or without food. No evidence-based time-of-day preference exists.

2 commercial forms

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

Leaf or pod extract

Most common in sports nutrition products.

Active constituent absorption is not characterized in humans.

Bark powder

Used in classical Ayurvedic formulas.

Traditional preparation; absorption profile unknown.

Safety

Generally well tolerated at typical supplement doses based on limited human exposure data. Long-term safety is unknown. Theoretical risk of altering thyroid function exists but is not well established in humans.

Who should be cautious

Avoid during pregnancy and breastfeeding due to insufficient safety data. People with thyroid disease (hypo- or hyperthyroidism) should consult a clinician before use. Stop before any thyroid testing or surgery so it does not confound results.

Interactions

Theoretical interaction with thyroid medications (levothyroxine, antithyroid drugs); monitor thyroid labs if you take both. No other significant interactions reported.

Frequently asked questions

Will Bauhinia purpurea boost my thyroid?⌄

There is no human evidence it does. The thyroid-related claims rest on test-tube chemistry, not clinical trials.

Is it safe to combine with thyroid medication?⌄

Theoretically it could interfere; talk to your doctor and monitor your thyroid labs if you choose to combine them.

References

Bauhinia purpurea on Wikidata — Wikidata link

Bauhinia purpurea on NIH DSLD (US supplement label database) — NIH Dietary Supplement Label Database link

Research on Bauhinia purpurea (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.