Testosterone supplementation after prostate cancer?

Two experts examine the pros and cons of this controversial practice

At some point in their 40s, men's testosterone production begins to slow. By some estimates, levels of this hormone drop by about 1% a year. As men get into their 50s, 60s, and beyond, they may start to have signs and symptoms of low testosterone. These include reduced sex drive and sense of vitality, erectile dysfunction, decreased energy, lower muscle mass and bone density, and anemia. When severe, these signs and symptoms characterize a condition called hypogonadism.