There has been some concern that use of soy products might lower male testosterone levels due to the phytoestrogens mimicking testosterone in the body. However, researchers reported a randomized trial where men 55-70 years old with low testosterone levels ate soy protein bars with or without soy phytoestrogens. Results demonstrated there was no risk and in fact demonstrated positive benefits.
PositiveTip: Low "T" or not, it seems safe to consume soy products–even supplements, though not necessarily recommended.