Do hormone treatments, like testosterone blockers, take away a trans woman’s physical advantage over a female in athletic competition? “Males have natural and categorical advantages over females in ...

If you’re taking finasteride — or the brand name versions Propecia or Proscar — you’re probably checking your hairline for changes. But there might be something else you’re worried about changing: ...

What used to be a niche treatment for men with legitimate medical conditions has morphed into "youth and vigor" as a ...

The Biden administration has been promoting puberty blocker and hormone therapy treatment drugs for transgender children even as it spent roughly $17 million on studies to analyze the dangers and ...

When I talk about our research team’s work on pregnancy in transgender people, people often recall Thomas Beatie, a pregnant man who appeared on “Oprah” and in People magazine in 2008. The media focus ...

Historically, testosterone has been associated with masculinity. Someone having high levels of testosterone was shorthand for perceived higher levels of aggression, strength, and libido. However, ...

The research is still new, but antidepressant medications may lower testosterone in some people. However, this side effect is treatable and usually mild. If you’re one of the millions of people who ...

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