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ingestible · for menopause support

Red Clover Isoflavones

Reviewed by the Nimbera editorial team · Last updated May 2026

van de Weijer & Barentsen 2002 RCT (Maturitas, PMID 12161042) - double-blind crossover trial in 30 postmenopausal women with >5 hot flushes/day; 80 mg/day red clover isoflavones (Promensil) significantly reduced hot flush frequency by 44% vs 16% for placebo over 12 weeks.$20-$35/month.

How to use

Take 40-160 mg/day of red clover isoflavones (formononetin, biochanin A, daidzein, genistein) in standardised extract form. Promensil (80 mg isoflavones) is the most studied brand. Take with food; effects typically emerge within 4-8 weeks.

How it works

Red clover isoflavones (especially formononetin, converted by gut bacteria to equol) are phytoestrogens - plant compounds that bind weakly to estrogen receptors (ERbeta preferentially over ERalpha). This partial agonist activity at estrogen receptors in the hypothalamus and bone may reduce vasomotor symptoms and support bone density without the full estrogen stimulation of HRT.

Where to buy

Promensil ($25-$35/60 tablets, the most-studied brand), Swanson Red Clover ($10-$15/60 capsules), Source Naturals Promensil ($25-$35) - at pharmacies, health food stores, and online.

Typical cost: $20-$35/month.

Safety notes

Phytoestrogens may be contraindicated in hormone-sensitive cancers (breast, ovarian, endometrial) - consult your oncologist before use. May interact with tamoxifen (competing at estrogen receptors - discuss with oncologist). May affect thyroid function at very large amounts - monitor thyroid levels in hypothyroid patients. Avoid during pregnancy and breastfeeding.

Drug & supplement interactions

  • Always tell your doctor or pharmacist about any supplements you take.
  • Interactions can occur with prescription medications, blood thinners, and immunosuppressants.
  • Herbal remedies can affect how the body absorbs or metabolises drugs.
  • Check drugs.com interactions checker before starting.

Clinical source

van de Weijer & Barentsen 2002 - Maturitas (PMID 12161042)

This information is compiled from primary clinical literature and is for informational purposes only. It is not a substitute for professional medical advice. Read our full disclaimer.