Medically reviewed by Danielle Weiss, MD PCOS is the most common cause of high testosterone in women, affecting about 10% ...

Starting around age 40, many men notice the first physical changes that may be related to their hormone levels: Energy wanes ...

Testosterone levels peak during male puberty and decline with age in both males and females. With low testosterone in males, you can have a decreased sex drive, trouble with erections, and low sperm ...

Dr. Sapolsky is a neuroscientist and primatologist. I was observing a 9-year-old male baboon in the Serengeti of East Africa one day in 1983. Baboon troops are very hierarchical, and this baboon was a ...

Everyone's talking about testosterone lately, but do we really know what it is? It's a hormone produced primarily in the ...