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Soy isoflavones reduce hot flashes
Researchers in one review analyzed 17 placebo-controlled studies in which the average dose of soy isoflavones was 54 mg per day, delivering 19 mg of the soy isoflavone genistein. Women who took part in the studies were perimenopausal to postmenopausal, and the studies ranged from six weeks to 12 months.

Combining all the data, compared to placebo, women who took soy isoflavones saw hot flash frequency and severity decline respectively by 21 percent and 26 percent. Women who took more than the average 19 mg of genistein had twice the relief from hot flashes as women who took lower doses.

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