A diagnosis requires two separate blood tests taken early in the morning (or two hours after waking) that show total ... and blood counts to ensure they are not abnormal before starting therapy.

Testosterone has long been linked to risk-taking, generosity, and competitiveness. But a new large-scale study—the biggest of ...

More and more older men are considering testosterone therapy to improve strength, libido, and overall health — but research presents a complex picture of limited benefits versus notable risks.

Testosterone gel can remain on the skin after application, creating a small but real risk for transfer through close contact ...