28-11-2011, 09:59 PM
Well, that depends on what the isoflavones are from. Those from soy, genistein and daidzein, are supposed to be weak ones. But I don't believe in weak phyto-estrogens any more. Activating a receptor is activating a receptor, period. Different assays give different results on relative strengths. What does matter in observed relative strength is the metabolism rate: a short lived phyto-estrogen will not perform in a long test. And soy and flax contain such high amounts of phyto-estrogens, that many experiments are done with stalling doses, which makes them look like they perform poorly.