For those who need it—men who have low levels of testosterone with symptoms such as low energy, a low libido, and depression, ...

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 ...

What used to be a niche treatment for men with legitimate medical conditions has morphed into "youth and vigor" as a ...

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 ...

A more accurate way to determine if your testosterone levels are notably low is to look for symptoms and/or signs associated with low testosterone in combination with low total testosterone levels.

Genetics play a role in low testosterone for some men, but underlying causes vary widely. Many genes influence testosterone ...