Genestein and daidzein are soy-derived phytoestrogens - isoflavones.
Of the seven isoflavones contained in soybeans, the most active are genistein and daidzein.
Genistein has been shown to bind to the same receptor sites as estrogen. This helps to maintain normal menstrual cycles and menopausal transitions. By competing for human estrogen receptors, genistein causes excess estrogen to be sent to the liver for elimination. Conversely, when there is too little estrogen (the situation during menopause), phytoestrogens - genistein and daidzein - substitute for the lack of human estrogen, mitigating the effects of its absence.
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