Most would say they are too weak at a normal intake. I try to stay away though. Not only do we have phyto estrogens mimicking hormones in our body but we also have xenoestrogens which are chemicals like bisphenyl a , parabens, pthalates that are tampering with our hormones. Recently it was discovered that heavy metals can also mimic hormones. Bottom line....our androgens and testosterone are under constantfrom natural as well as unnatural agents.