A single gene that regulates testosterone levels in a 'crazy' species of shore bird controls the development of three wildly different types of males, a new study has found. Ruffs have long fascinated ...

Over-the-counter testosterone powders are often sold as natural testosterone boosters. Testosterone powders are made of herbs and other substances. Research about whether these products effectively ...

Testosterone is an important hormone in both men and women. It's the key male sex hormone, but in addition to regulating fertility, testosterone also affects muscle mass, body fat distribution and red ...

A testosterone test checks the level of testosterone in your blood. Doctors use it to diagnose conditions caused by too much or too little of the hormone. People with vaginas make testosterone too, ...

A single gene that regulates testosterone levels in a “crazy” species of shore bird controls the development of three wildly different types of males, an international study involving researchers at ...