Testosterone

Administering testosterone was found to have "little to no effect" on a man's physical functioning, his chances of feeling depressed, energy levels, feelings of vitality, or his thinking skills.

Research follows South African runner Caster Semenya being banned from competing by the IAAF without taking medication to lower her testosterone levels.

Scientists treated men with testosterone and assessed their ability to empathize.

The pill works by suppressing the hormones that control the function of the testis and sperm production, the author of a new study explains.

Scientists believe that females in opposite-sex twins are exposed to higher than normal levels of testosterone in the womb, which could affect their behavior.

Low levels of testosterone can make men lethargic, affect their libido and cause erectile dysfunction.

The findings add to the alarm surrounding the current male infertility crisis.

More than 400 couples will be involved in the trial, expected to take place in several different countries.

Pumpkin spice lattes might play a role in this.

'We think this is one of the biggest survival benefits ever reported in a trial of an adult solid tumor,' said one expert.

The largest study of its kind on testosterone, an increasingly-popular supplement, matches prior work on impulse behavior but the data 'don't tell a clear story.'

"Mandating tests for intersex athletes appears arbitrary and unfair and encourages athletes to undergo unnecessary medical operations."

A new study suggests elevated levels of cortisol and testosterone may compel traders to make riskier investment decisions.

Talented distance runners could possess evolutionary 'signal' from the days of hunter gatherers.

As all men age, their testosterone production lowers. So why do we blame A-Rod for seeking treatment?