Red clover (isoflavones)
Phytoestrogen source with moderate signal for hot flushes, effect smaller than black cohosh but with a different mechanism.
Why
Red clover (Trifolium pratense) is a rich source of isoflavone phytoestrogens (biochanin A, formononetin, daidzein, genistein). Meta-analyses of RCTs in postmenopausal women report a modest reduction in daily hot flush frequency versus placebo. Effect is smaller than oestrogen-based options and smaller than black cohosh in head-to-head comparisons, but offers an alternative when other options are declined or not tolerated.
How it works
Isoflavones bind weakly to oestrogen receptor β (selective oestrogen receptor modulator-like effect), more strongly than the soy isoflavones at clinical doses. Effect on the thermoregulatory threshold reduces hot flush frequency in some women.
Expected onset · Symptom changes typically over 8–12 weeks
How to take
Dosage
Standardised isoflavone extract: 40–80 mg/day total isoflavones (Promensil, Menoflavon).
Timing
Once daily with food
On the label
Standardised to total isoflavone content (e.g. Promensil 40 mg, Menoflavon 80 mg). Raw red clover tea is too dilute for the trial doses.
Ideal for
Postmenopausal women with troublesome hot flushes who prefer a phytoestrogen approach over central-acting botanicals.
Safety
Evidence
Myers 2017 Maturitas meta-analysis (5 trials with daily flush frequency data): red clover isoflavones reduced daily flushes by 1.7 vs 0.8 on placebo. Cochrane 2013 SR concluded a modest signal at higher isoflavone doses (≥80 mg/day genistein-equivalent). Effect smaller than HRT and smaller than black cohosh in indirect comparison.
- Lethaby et al., Cochrane Database Syst Rev 2013, phytoestrogens for vasomotor menopausal symptoms
- Myers & Vigar, Maturitas 2017, effects of red clover isoflavones on hot flush frequency: systematic review and meta-analysis
- Geller et al., Menopause 2009, Promensil red clover for menopausal symptoms (RCT, n=89)
Where to get it
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