Okay, here it is -
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2701485/
http://toptestosteroneboosters.org/testosterone-replacement-therapy/
http://www.harvardprostateknowledge.org/a-harvard-expert-shares-his-thoughts-on-testosterone-replacement-therapy...
Testosterone therapy indeed can help improve testosterone levels in your body and reverse the effects of hypogonadism. And you are in your 40ties or 50ties and you feel energetic, your sex desire is still on point – there is no need for this therapy. You are lucky!
But, for men who are not...