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Supplement

Soy Isoflavones

Also known as: Phytoestrogens, genistein, daidzein, soy extract

Plant-derived compounds from soybeans with weak oestrogen-like activity. Consumed through diet (tofu, soya milk, edamame) or in concentrated supplement form. Studied for reduction of hot flushes, bone density support, and cardiovascular health in menopausal women.

This page contains self-reported experiences from the Narrated community — not clinical data. Outcomes are subjective. Always consult your doctor or specialist before starting, stopping, or changing any approach.

Regulatory status does not mean an approach is safe or unsafe. Laws vary by country — check your local regulations.

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Research Context

Research context compiled from published sources

How does Soy Isoflavones work?

Isoflavones (particularly genistein and daidzein) bind preferentially to oestrogen receptor beta (ERβ) with much lower affinity than oestradiol. This selective binding may produce mild oestrogenic effects in bone, blood vessels, and the brain while having less stimulatory effect on breast and uterine tissue. Equol-producers (women whose gut bacteria convert daidzein to equol) may experience greater benefit.

Research Depth

Unknown

Long-Term Evidence

Unknown

Known Interactions
Tamoxifen (theoretical interaction)Thyroid medications (separate dose by at least 4 hours)Anticoagulants
Reported Contraindicated Populations
History of oestrogen-sensitive breast cancer (discuss with oncologist)Women taking tamoxifenThyroid disorders (timing considerations)Soya allergy
Published Dose Ranges
40120 mg isoflavones/dayoral · once daily
Clinical trials

Dose ranges from published research. Individual dosing should be determined with your healthcare provider based on your specific circumstances.

Factual research context from published sources — not a safety assessment or recommendation. Research classifications may change as new data emerges.

Related Approaches

Other Supplement tracked on Narrated.

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