Safety Profile
Overall safety rating: Generally Safe
Red Clover Side Effects & Safety
Evidence:Moderate
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This content is for informational purposes only and does not constitute medical advice. Statements about dietary supplements have not been evaluated by the FDA and are not intended to diagnose, treat, cure, or prevent any disease. Individual results may vary — consult your healthcare provider before starting any supplement. Full disclaimer
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
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References
- Meta-analysisLethaby A, Marjoribanks J, Kronenberg F, et al. (2007). Phytoestrogens for menopausal vasomotor symptoms. Cochrane Database of Systematic Reviews. DOI PubMed
- RCTTice JA, Ettinger B, Ensrud K, et al. (2003). Phytoestrogen supplements for the treatment of hot flashes: the Isoflavone Clover Extract (ICE) Study. JAMA. DOI PubMed
- Irawan A, Jayanegara A, Niderkorn V (2024). Impacts of red clover and sainfoin silages on the performance, nutrient utilization and milk fatty acids profile of ruminants: A meta-analysis.. Journal of animal physiology and animal nutrition. DOI PubMed
- Meta-analysisKanadys W, Barańska A, Błaszczuk A, Polz-Dacewicz M, et al. (2021). Evaluation of Clinical Meaningfulness of Red Clover (Trifolium pratense L.) Extract to Relieve Hot Flushes and Menopausal Symptoms in Peri- and Post-Menopausal Women: A Systematic Review and Meta-Analysis of Randomized Controlled Trials.. Nutrients. DOI PubMed
- Meta-analysisKanadys W, Baranska A, Jedrych M, Religioni U, et al. (2020). Effects of red clover (Trifolium pratense) isoflavones on the lipid profile of perimenopausal and postmenopausal women-A systematic review and meta-analysis.. Maturitas. DOI PubMed
- Meta-analysisLuís Â, Domingues F, Pereira L (2018). Effects of red clover on perimenopausal and postmenopausal women's blood lipid profile: A meta-analysis.. Climacteric : the journal of the International Menopause Society. DOI PubMed
- Ghazanfarpour M, Sadeghi R, Roudsari RL, Khorsand I, et al. (2016). Red clover for treatment of hot flashes and menopausal symptoms: A systematic review and meta-analysis.. Journal of obstetrics and gynaecology : the journal of the Institute of Obstetrics and Gynaecology. DOI PubMed
Show 5 more references
- Gartoulla P, Han MM (2014). Red clover extract for alleviating hot flushes in postmenopausal women: a meta-analysis.. Maturitas. DOI PubMed
- Mohsen A, Fatemeh K, Leila N, Mona P, et al. (2021). Pharmacological and therapeutic properties of the Red Clover (Trifolium pratense L.): an overview of the new finding.. Journal of traditional Chinese medicine = Chung i tsa chih ying wen pan. DOI PubMed
- Fritz H, Seely D, Flower G, Skidmore B, et al. (2013). Soy, red clover, and isoflavones and breast cancer: a systematic review.. PloS one. DOI PubMed
- Bolgova O, Shypilova I, Mavrych V (2025). Natural strategies to optimize estrogen levels in aging women: mini review.. Frontiers in aging. DOI PubMed
- Xiong Z, Zhang X, Zhang S, Li K, et al. (2025). Effects of red clover isoflavone on lactation performance, milk quality and nitrogen metabolism in dairy cows.. Animal nutrition (Zhongguo xu mu shou yi xue hui). DOI PubMed