Annalisa (Nalis) Merelli is a contributing writer at STAT focused on boys’ and men’s health. The first thing Abraham Morgentaler learned about testosterone is that it’s a brain hormone. It was in a ...

Rob, 42, is a fitness guy. He loves working out, spends his spare time in the jujitsu gym and eats a high-protein diet heavy on avocado oil. He cares about his health and wants to optimize it, and a ...

Testosterone levels in men have been on a slow and steady decline over the years, and the signs don’t typically appear overnight. They creep up slowly, almost imperceptibly, until something feels off.

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 ...

The first thing Abraham Morgentaler learned about testosterone is that it’s a brain hormone. It was in a lab at Harvard, while an undergraduate in the late 1970s, where he had this realization: A ...