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

This article was reviewed by Felix Gussone, MD. If you’ve been feeling a bit more couch potato than go-getter lately, dragging through the day, snapping at people for no reason, or wondering where ...

Testosterone is one of the few hormones that’s broken out of biology textbooks and into the popular consciousness. For years it has been a shorthand for all things stereotypically male—ever notice how ...

Add Yahoo as a preferred source to see more of our stories on Google. Reeder explains that testosterone is far more involved than you would first think -- it plays are part in everything from muscle ...

Testosterone is the quintessential male hormone (androgen), and it’s a busy one, helping to regulate intimate function, muscle mass, red blood cell count, mood, and more. But not all testosterone in ...