biochanin

PhytochemicalIsoflavoneBest with a meal

What is it

Biochanin A is an isoflavone phytoestrogen found in red clover, chickpeas, soy, and other legumes. It is sold as a standardized constituent of red clover and isoflavone supplements marketed for women's health and prostate support.

Evidence for 1 use

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

Menopausal symptoms (red clover isoflavones)

Limited Evidence

Trials of red clover isoflavone extracts, including biochanin A, show small reductions in hot flashes in some studies, with mixed overall results.

How it works

Biochanin A is metabolized in the gut to genistein, a more strongly estrogenic isoflavone. Like other isoflavones, it binds weakly to estrogen receptors, with preferential activity at ER-beta. Preclinical work also suggests aromatase inhibition and effects on prostate cell biology. Clinical evidence comes mainly from red clover trials in menopausal symptoms, with modest and inconsistent results. Biochanin A is one of several isoflavones contributing to these effects.

Dosage

DSLD does not list a single standardized dose for isolated biochanin A. Red clover extracts typically supply 40-80 mg of total isoflavones per day. No RDA or upper limit exists.

When and how to take it

Usually taken with food once daily.

2 commercial forms

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

Red clover extract standardized to biochanin A and other isoflavones

Most common consumer form.

Standardized by total isoflavone content

Isolated biochanin A

Used in research and a few specialty supplements.

Converted to genistein in gut

Safety

Short-term use of red clover isoflavones is generally well tolerated. Side effects include headache, nausea, and breast tenderness. Long-term high-dose isolated biochanin A has not been thoroughly studied.

Who should be cautious

Avoid in pregnancy and breastfeeding. People with a history of hormone-sensitive cancers should consult a clinician. Use cautiously with hormone or anticoagulant medications.

Interactions

Possible additive effects with hormone therapy and tamoxifen. Theoretical interactions with anticoagulants due to coumarin content of red clover.

Food sources

Red clover

Amount
Variable
%DV
—

Chickpeas

Amount
Small amount
%DV
—

Frequently asked questions

Is biochanin estrogenic?⌄

Yes, weakly. It binds estrogen receptors directly and is also converted to the more estrogenic genistein.

Is it safe if I have a breast cancer history?⌄

Caution is warranted. Discuss isoflavone supplements with your oncologist before use.

References

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

Research on biochanin (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.