This article was reviewed by Felix Gussone, MD. What Is Testosterone? As the primary male hormone, or androgen, testosterone ...

Here’s what the research actually says about low T and depression, according to a doctor familiar with testosterone ...

Testosterone fuels male sex drive and erectile function and influences everything from bone density and muscle mass to fat distribution, red blood cell production, mood and energy levels.

It is not just women who face the harrowing hormonal effects of “the change.” Andropause — commonly called “male menopause” or “manopause” — refers to age-related declines in testosterone levels. And ...