Testosterone, a sex hormone produced by both males and females, is often associated with libido and muscle mass. This universal hormone is also responsible for much more, like sleep, bone health and ...

The drugs have soared in popularity, with some men taking them for unapproved uses like anti-aging or increasing muscle mass.

Testosterone replacement therapy (TRT) is a common treatment for easing symptoms of low testosterone (hypogonadism) in men. These symptoms include ED, low libido, fatigue, muscle loss, and depression.