What Is Low Testosterone (Testosterone Deficiency)? Testosterone is the primary androgen — or male hormone — in your body. Low testosterone affects up to 39 percent of adult men in the US over the age ...

TESTOSTERONE affects more than just sexual function. It plays a role in energy, mood, muscle strength, and mental focus. When levels drop, men may experience fatigue, low mood, or a reduced sex drive.

Testosterone is the primary androgen — or male hormone — in your body. Low testosterone affects up to 39 percent of adult men in the US over the age of 45, and becomes increasingly prevalent as men ...