What are normal testosterone levels by age? An older photographer mentors a younger one. Testosterone is an important hormone. It helps men develop during puberty, and as they age, it plays a critical ...

Testosterone is an important hormone. It helps men develop during puberty, and as they age, it plays a critical role in helping control fat levels, cholesterol, and glucose levels. Testosterone ...

Ever wonder if your testosterone levels are normal? It’s actually a pretty important question, since low testosterone can cause a lot of unpleasant effects, everything from a low sex drive to muscle ...

Testosterone is a sex hormone that regulates a number of processes in the human body, including fertility, sex drive, bone mass, fat distribution, muscle mass, and red blood cell production.

What you eat or drink may affect levels of the male sex hormone, but whether a diet can increase libido or energy depends on many things. Credit...Aileen Son for The New York Times Supported by By ...