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Red Clover Extract
Isoflavone-rich plant with weak estrogenic activity. Evidence for fewer hot flashes is modest, and one year-long trial found less bone loss at the spine but not the hip.
What the evidence says
Red Clover doesn't have enough studies with structured effect-size data yet to pool a verdict. Browse the studies below for individual findings.
Most evidence is from high-quality meta-analyses and randomised trials published 1999–2026 with a typical study size of 208 participants.
Based on 69 studies · 22 meta-analyses · 31 RCTs · 901,629 total participants
Confidence
High confidenceWhat the studies found
By outcome
Red clover's isoflavones are biochanin A and formononetin, not the genistein and daidzein of soy, so soy evidence does not transfer and is cited on the soy isoflavones entry instead. Red clover's own evidence is modest: a Trifolium pratense systematic review finds a marginally significant effect on hot flushes, a clinical-meaningfulness review calls for further well-designed studies, and the one-year bone trial is mixed, with less lumbar-spine bone loss than placebo but no effect at the hip or on bone resorption markers. That is Emerging.
27 randomised trials
96% were about Red Clover in an audit of 27 of them
Every randomised or controlled trial of Red Clover indexed in PubMed, not a hand-picked subset. Meta-analyses and systematic reviews are deliberately excluded from this count: most of them cover many compounds at once, so counting them would inflate it.
PubMed · as of Sep 2026
1 trial ongoing or recruiting · 11 completed on ClinicalTrials.gov
Registered trials show research momentum for Red Clover, not proof of effect — a registration is a plan, and posted results are sponsor-reported, not peer-reviewed. They are never counted toward the evidence rating above.
Browse these trials on ClinicalTrials.govClinicalTrials.gov · as of Oct 2026
Red Clover (Trifolium pratense) is a flowering plant rich in isoflavones, particularly genistein, daidzein, formononetin, and biochanin A. These compounds have weak estrogenic activity, making red clover popular for managing menopausal symptoms like hot flashes, where the evidence is strongest.
Research also suggests potential benefits for bone mineral density and arterial compliance. Effects on plasma lipids are mixed — some meta-analyses show a modest reduction in total cholesterol, while other trials find no significant change.
Binds to estrogen receptors with weak estrogenic effects
May slow bone loss through estrogenic effects
May improve arterial flexibility and lipid profiles
How Red Clover works — from molecular targets to health outcomes. Click an edge to see supporting research.This visualization is in beta — pathways are being refined and expanded.
Avoid due to estrogenic effects
Primary target population; consult physician
Red clover products may have estrogenic activity. Ask the prescriber before adding one to estrogen therapy. Evidence for the exact combination and product is limited.
May interfere with anti-estrogen effects
A clinically important interaction between red clover and each listed anticoagulant or antiplatelet medicine has not been established from the evidence supplied here. Ask a pharmacist to assess the exact supplement, medicine and other bleeding risks before use. This possible interaction has not been individually evaluated for this supplement; its likelihood and severity are unknown. If you take an anticoagulant or antiplatelet medicine, ask a pharmacist or prescriber before using this product. Do not stop or change prescribed medicines based on this notice.
Tip: Reduce dose
Tip: May resolve with continued use
Tip: Take with food
Red Clover has an evidence score of 4.5/10 — emerging evidence based on 69 indexed studies, including 11 meta-analyses. Isoflavone-rich plant with weak estrogenic activity. Evidence for fewer hot flashes is modest, and one year-long trial found less bone loss at the spine but not the hip. Representative study: PMID 39708251.
The commonly studied dose of Red Clover is 40-80mg isoflavones daily. Individual needs vary — start at the lower end of the range and adjust based on how you respond.
Timing is flexible for Red Clover — consistent daily use matters more than the time of day. Red clover (Trifolium pratense) isoflavones — biochanin A, formononetin, genistein, and daidzein — act as selective estrogen receptor modulators (SERMs).
Red Clover has a safety rating of "moderate". That is a category, not a measure of individual risk, and there are precautions worth knowing. Reported side effects are uncommon and include breast tenderness, headache, nausea. Use caution if any of these apply to you: Hormone-sensitive cancers (breast, ovarian, uterine); History of endometriosis; History of blood clots.
Vitamin D3
Probably helpsHormone-like vitamin that regulates 1,000+ genes — deficiency is widespread and linked to poor immunity, depression, and bone loss.
Maca
Too few graded studiesAndean root with modest evidence for improving sexual desire — small RCTs are encouraging but reviews still rate the overall evidence as limited.
DHEA
Probably helpsAdrenal hormone precursor that declines with age. In postmenopausal women with normal adrenal function, trials found no effect on sexual symptoms or metabolic markers.
St. John's Wort
Likely helpsModulates serotonin, dopamine, and norepinephrine; studied for mood, with trials in mild-to-moderate depression comparing it to SSRIs — requires drug-interaction caution.
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Reviewed by Dr. Baher Al Hakim · Last reviewed September 2026 · evidence from 69 studies · how we score · editorial policy
This information is for educational purposes only. It is not a substitute for professional medical advice. Always consult a qualified healthcare provider before starting, stopping, or changing any supplement or medication.
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