Testosterone therapy can help men with low hormone levels, but experts warn of serious risks including stroke, prostate ...

Contrary to popular belief, having higher levels of testosterone doesn't necessarily make men have a higher libido. Day-to-day changes in testosterone levels were discovered to have no real link to ...

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.

Testosterone replacement therapy is popular. In men with a deficiency, injections should provide pep, a stronger libido and lower anxiety. Now many with normal levels hope to achieve the same benefits ...