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SupplementScience

Red Clover Side Effects & Safety

This content is for informational purposes only and does not constitute medical advice. Consult your healthcare provider before starting any supplement. Full disclaimer

Safety Profile

Overall safety rating: Generally Safe

Potential Side Effects

  • Mild GI symptoms — bloating, nausea (uncommon)
  • Headache (rare)
  • Breast tenderness (rare, related to mild estrogenic activity)
  • Skin rash (very rare)

Drug & Supplement Interactions

  • Hormone-sensitive conditions — phytoestrogens may theoretically interact with breast cancer, endometriosis, or uterine fibroids; consult physician
  • Tamoxifen and aromatase inhibitors — potential interaction via estrogen receptor binding; avoid without oncologist approval
  • Blood thinners — red clover contains small amounts of coumarins; monitor if on warfarin
  • Hormonal contraceptives — theoretical interaction; evidence is limited but caution is reasonable

Maximum Dose

Do not exceed: 160mg total isoflavones daily has been studied; standard range is 40-80mg

Full Red Clover Guide

References

  1. (). Phytoestrogens for menopausal vasomotor symptoms. Cochrane Database of Systematic Reviews. DOI
  2. (). Phytoestrogen supplements for the treatment of hot flashes: the Isoflavone Clover Extract (ICE) Study. JAMA. DOI