Anti-doping agencies are tracking levels of various molecules in athletes’ blood and urine over time to increase their ability to detect drug misuse.

A study links having a male twin with women’s educational, financial, and childbearing decisions. Researchers suspect prenatal exposure to testosterone may play a role.

The gel, which men rub on their upper bodies daily, delivers synthetic progestin to block the testes from producing normal levels of sperm.

In Chapter 6, “The Hormonal Essence of the T-Rex?” author Cordelia Fine considers the biological dogma that testes, and the powerful hormones they exude, are the root of all sexual inequality.

Stoned, Anxious, The Deeper Genome, and Testosterone

A study documents boys with autism who were exposed to elevated levels of testosterone, cortisol, and other hormones in utero.

In the long-fought battle against baldness, researchers are finally identifying molecular pathways that can be manipulated to generate new hair follicles.

In his latest book, author John Coates describes the tension and exultation of the trading floor from a biological perspective.

Hormones in the brain control sex-specific behaviors by activating individual genetic programs.

Caring for a child can suppress testosterone levels in men.

Men and women may have different finger-length ratios as a result of different sex hormone exposure during early embryonic development.