The testicles and ovaries produce testosterone. Producing too little or too much testosterone can affect your physical and mental health. Testosterone is a hormone found in humans, as well as in other ...

Low testosterone may affect sexual desire and erection ability, with significant effects typically occurring at very low testosterone levels. High testosterone usually doesn’t cause erectile ...

Testosterone is the main sex hormone in men. It’s best known for its role in the development of male sexual characteristics and physical features, but there are also many surprising and lesser known ...

In men, marked hypogonadism due to pituitary or testicular disease generally has readily recognizable clinical manifestations, such as decreases in libido and sexual activity, loss of secondary sex ...

Testosterone is the principle sex hormone responsible for the development of reproductive function in male vertebrates. Testosterone is one of the hormones referred to as androgens, which are also ...