Energy, strength, focus — testosterone powers more than you think. It’s not just about the gym or bedroom performance. Testosterone is a core hormone that influences motivation, confidence, mental ...

Discover how men 45–55 can preserve strength, energy, and vitality. Learn the science behind testosterone decline and how to ...

A potential new male contraceptive drug has just undergone its first tests in human volunteers. The results give the first indication that the drug, which does not use artificial hormones or affect ...

Technically, yes, testosterone is a steroid hormone. But it’s not the kind of steroid that gets high-performing athletes stripped of their titles. Rather, testosterone replacement therapy (TRT) is a ...

Testosterone is being hailed as the secret to better energy, mood, and sex drive. Here’s what experts say about when it actually does help—and when it doesn’t. Women naturally produce testosterone, a ...

There is no F.D.A.-approved testosterone product for women. Insurance won’t cover it. Many doctors won’t prescribe it. It’s become a cultural phenomenon. Credit... Supported by By Susan Dominus Spend ...

Dr. Sapolsky is a neuroscientist and primatologist. I was observing a 9-year-old male baboon in the Serengeti of East Africa one day in 1983. Baboon troops are very hierarchical, and this baboon was a ...

Members of an FDA expert panel urged the agency to expand labeling for testosterone replacement therapy and remove its classification as a controlled substance. Like previous FDA expert panels, the ...

In men, marked hypogonadism due to pituitary or testicular disease generally has readily recognizable clinical manifestations, such as decreases in libido and sexual activity, loss of secondary sex ...