KYZATREX ® is a controlled substance (CIII) because it contains testosterone. It is not known if KYZATREX ® is safe or effective in males younger than 18 years old. Improper use may affect bone growth ...

As men age, their testosterone levels decrease, but prior studies of the effects of administering testosterone to older men have been inconclusive. Now, research shows that testosterone treatment for ...

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

For more than 80 years, men have been told that testosterone helps prostate cancer grow. But a very different picture has emerged over the past two decades.