There are quite few high quality human studies showing phytoestrogens to have negative effects, and quite a few showing positive effects? Isoflavones (the one

There are quite few high quality human studies showing phytoestrogens to have negative effects, and quite a few showing positive effects? Isoflavones (the one most common in soy) has not been shown to affect testosterone levels or fertility, while having lots of positive effects. The estrogen activity of phytoestrogens is, as a bonus, very low.