NutriDex

The Supplement Research Compendium
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Red Clover

Trifolium pratense

Isoflavone herb marketed for hot flushes; trials are inconsistent.

Mixed evidence ✨Joint & Skin

✚ Updated · How we grade evidence

Evidence tier
Mixed
Research weight
Citations
9 verified / 9
Classification
Joint & Skin
❝
What the evidence says. Graded mixed: the 2013 Cochrane review found no significant reduction in hot flushes, yet later meta-analyses report a small, marginally significant benefit at ≥80 mg/day — so any effect is modest, inconsistent, and clouded by large placebo responses and industry funding. (Mixed evidence: Conflicting results across studies; benefit uncertain.)

What is Red Clover?

Red Clover (Trifolium pratense) is a joint and skin supplement used for menopausal hot flushes. NutriDex grades the human evidence as Mixed. Red clover is a phytoestrogen-rich legume whose isoflavones (mainly biochanin A and formononetin) weakly bind estrogen receptors, which is why it is sold for menopause. Evidence is genuinely split. The 2013 Cochrane review of phytoestrogens found no significant difference between red clover (Promensil) and placebo for hot flushes, while later meta-analyses found a small reduction of roughly 1.7–2 fewer flushes per day, often only at the borderline of statistical significance and driven by higher doses (≥80 mg/day) and longer trials. More consistent are modest lipid effects: a 2020 meta-analysis of 12 RCTs reported total cholesterol down ~12 mg/dL and LDL down ~11 mg/dL. Effects on bone density and other symptoms are weak and inconsistent. Trials are frequently short, small, and industry-funded, with strong placebo responses, so red clover is best seen as a possible mild aid, not a reliable treatment.

Purported Benefits

✓Menopausal hot flushes
✓Lower LDL & total cholesterol
✓Slow menopausal bone loss
✓Skin & menopausal symptom support

Evidence by outcome

The same supplement can be well-proven for one use and unproven for another — here is the human evidence graded outcome by outcome.

OutcomeEvidenceEffectStudies
Menopausal hot flushesCochrane found no benefit; later meta-analyses show ~1.7-2 fewer flushes/day, often borderline significance. Mixed ↔ mixed · small 3
Lower LDL & total cholesterolMeta-analysis of 12 RCTs: TC -12, LDL -11 mg/dL; supported by a 2-year RCT. Moderate ↑ benefit · small 3
Overall menopausal symptom scoreSmall RCTs report improved Kupperman/Menopause Rating Scale scores; short, small, placebo-prone trials. Preliminary ↑ benefit · moderate 2
Breast density / endometrial safety3-year RCT in high-risk women found no adverse effect on breast density or endometrium. Moderate — no effect · negligible 1

Dosing & Compounds

Typical Dose
40–80 mg/day standardized red clover isoflavones (e.g. Promensil, Rimostil) for 12 weeks to 1 year.
Active Compounds
Isoflavones (biochanin A, formononetin)Genistein & daidzeinCoumestrol

Safety & Cautions

Generally well tolerated; reported effects include mild headache, nausea and rash, with red clover isoflavones used safely in studies up to 2–3 years. Because the isoflavones are estrogenic, avoid in pregnancy and breastfeeding and use caution if you have an estrogen-sensitive condition (breast, uterine or ovarian cancer, endometriosis, fibroids), though human data so far show no clear harm to breast or endometrial tissue. Coumarin-related constituents may add to bleeding risk, so use caution with anticoagulants/antiplatelets (warfarin, aspirin); it may also interact with tamoxifen, hormonal therapies and drugs metabolized by CYP enzymes. Educational only — always check with your doctor or pharmacist before combining Red Clover with any medicine.

Red Clover drug interactions

Known or theoretical interactions between Red Clover and common medications — educational, not exhaustive. Always check with your doctor or pharmacist before combining Red Clover with any medicine.

Caution
Blood thinners (warfarin, DOACs)
Red clover contains coumarins and may increase bleeding risk when combined with blood thinners.
Coumarin constituents can add anticoagulant/antiplatelet effects, compounding warfarin and DOACs. NCCIH — Red Clover
Caution
Hormone therapy / tamoxifen
Red clover has estrogen-like activity; use caution with hormone therapy, tamoxifen, or hormone-sensitive cancers.
Red clover isoflavones are structurally similar to estrogen and may bind estrogen receptors, potentially affecting hormone-sensitive tissue. NCCIH — Red Clover

Key Studies

Meta-analysis Kanadys 2021 ✓ PubMed
Meta-analysis of 8 trials: red clover cut daily hot flushes by WMD -1.73 (95% CI -3.28 to -0.18); benefit clearest at ≥80 mg/day.
Meta-analysis Kanadys 2020 ✓ PubMed
Meta-analysis of 12 RCTs (n=1284): total cholesterol -12.3 mg/dL, LDL -10.6 mg/dL, triglycerides -10.2 mg/dL, HDL +1.6 mg/dL.
Meta-analysis Ghazanfarpour 2016 ✓ PubMed
Meta-analysis (6 trials) found hot flushes fell more with red clover than placebo, MD -1.99/day, but only marginally significant (p=0.067).
Meta-analysis Lethaby 2013 (Cochrane) ✓ PubMed
Across 5 Promensil trials, no significant difference in hot-flush frequency vs placebo; overall no conclusive phytoestrogen benefit.
RCT Yigit 2024 ✓ PubMed
RCT: red clover isoflavones improved lipids (lower TC, LDL, triglycerides; higher HDL) and lowered Menopause Rating Scale scores vs placebo.
RCT Clifton-Bligh 2015 ✓ PubMed
RCT: 50 mg/day formononetin-enriched red clover lowered LDL cholesterol 12% vs 2% on placebo over 2 years (p=0.005).
RCT Powles 2008 ✓ PubMed
3-year RCT in women with breast-cancer family history: red clover isoflavones did not adversely affect breast density or endometrium; well tolerated.
RCT Hidalgo 2005 ✓ PubMed
RCT (n=60): 80 mg/day red clover isoflavones cut Kupperman menopausal index from 27.2 to 5.9 vs 20.9 on placebo over 90 days (p<0.05).
Review Bermingham 2026 ✓ PubMed
Mitigation of enteric methane production by ruminants: strategies relevant to New Zealand's pasture-based agricultural systems
9 sources cited · 9 verified Search all studies on PubMed ↗

Common questions about Red Clover

What is Red Clover used for?

Red Clover is most often taken for Menopausal hot flushes, Lower LDL & total cholesterol, Slow menopausal bone loss, Skin & menopausal symptom support. Isoflavone herb marketed for hot flushes; trials are inconsistent.

Does Red Clover work — what does the evidence say?

Mixed evidence. Conflicting results across studies; benefit uncertain. Red clover is a phytoestrogen-rich legume whose isoflavones (mainly biochanin A and formononetin) weakly bind estrogen receptors, which is why it is sold for menopause. Evidence is genuinely split. The 2013 Cochrane review of phytoestrogens found no significant difference between red clover (Promensil) and placebo for hot flushes, while later meta-analyses found a small reduction of roughly 1.7–2 fewer flushes per day, often only at the borderline of statistical significance and driven by higher doses (≥80 mg/day) and longer trials. More consistent are modest lipid effects: a 2020 meta-analysis of 12 RCTs reported total cholesterol down ~12 mg/dL and LDL down ~11 mg/dL. Effects on bone density and other symptoms are weak and inconsistent. Trials are frequently short, small, and industry-funded, with strong placebo responses, so red clover is best seen as a possible mild aid, not a reliable treatment.

What is the typical dose of Red Clover?

40–80 mg/day standardized red clover isoflavones (e.g. Promensil, Rimostil) for 12 weeks to 1 year.

Is Red Clover safe? Any cautions or side effects?

Generally well tolerated; reported effects include mild headache, nausea and rash, with red clover isoflavones used safely in studies up to 2–3 years. Because the isoflavones are estrogenic, avoid in pregnancy and breastfeeding and use caution if you have an estrogen-sensitive condition (breast, uterine or ovarian cancer, endometriosis, fibroids), though human data so far show no clear harm to breast or endometrial tissue. Coumarin-related constituents may add to bleeding risk, so use caution with anticoagulants/antiplatelets (warfarin, aspirin); it may also interact with tamoxifen, hormonal therapies and drugs metabolized by CYP enzymes.

How many studies support Red Clover?

NutriDex cites 9 sources for Red Clover, graded "Mixed".

Does Red Clover interact with any medications?

Yes — known or theoretical interactions include: Blood thinners (warfarin, DOACs) (caution), Hormone therapy / tamoxifen (caution). This is educational and not exhaustive; always check with your doctor or pharmacist before combining Red Clover with any medicine.

Cite this page
APA

Peh, D. (2026). Red Clover (Trifolium pratense): Benefits, Dosage, Side Effects & Evidence. NutriDex — The Supplement Research Compendium. Retrieved 10 Aug 2026, from https://nutridex.info/s/red-clover

BibTeX
@misc{nutridex_red_clover,
  author       = {Peh, Daryl},
  title        = {Red Clover (Trifolium pratense): Benefits, Dosage, Side Effects \& Evidence},
  year         = {2026},
  howpublished = {NutriDex --- The Supplement Research Compendium},
  url          = {https://nutridex.info/s/red-clover},
  note         = {Reviewed by Dr Daryl Peh, MBBS Singapore, MMed FM. Accessed 2026-08-10}
}

For medical claims, citing the underlying primary studies linked above is preferred. NutriDex is an educational reference, not medical advice.

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