Randomized placebo-controlled trial of an isoflavone supplement and menopausal symptoms in women

Climacteric : the Journal of the International Menopause Society
R J BaberL West

Abstract

To test the hypothesis that increasing the intake of isoflavones by dietary supplementation may produce a therapeutic effect in reducing the incidence and severity of hot flushes in menopausal women. Fifty-one postmenopausal women were randomized to placebo and active (one tablet per day of a 40-mg isoflavone supplement) groups in a cross-over design trial. After a 1-week run-in period, subjects were commenced on a 12-week period of treatment (active or placebo), followed by a 1-month placebo wash-out period, then crossed over to the alternative treatment regimen for a further 14 weeks. Symptom diaries were maintained throughout the trial and at the start and end of treatment. Plasma sex hormone binding globulin (SHBG) assay, full blood count, biochemical profiles, vaginal swabs and vaginal ultrasound scans were performed and isoflavones determined in 24-h urine collections by high-pressure liquid chromatography (HPLC) analysis. There was no significant difference between active and placebo groups in the reduction in hot flushes between start and finish time-points. Analysis performed on interim data time-points revealed a substantially greater reduction in flushing in the active group than placebo at 4 and 8 weeks after commen...Continue Reading

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