Serum testosterone concentrations decrease as men age, but benefits of raising testosterone levels in older men have not been established. We assigned 790 men 65 years of age or older with a serum ...

Testosterone is one of the few hormones that’s broken out of biology textbooks and into the popular consciousness. For years it has been a shorthand for all things stereotypically male—ever notice how ...

Testosterone, a sex hormone produced by both males and females, is often associated with libido and muscle mass. This universal hormone is also responsible for much more, like sleep, bone health and ...

The efficacy and safety of testosterone treatment for hypoactive sexual desire disorder in postmenopausal women not receiving estrogen therapy are unknown. We conducted a double-blind, ...

Low testosterone (or "low T") is a condition in which the body is unable to produce normal amounts of the hormone testosterone. It causes different symptoms depending on age and when the condition ...

It's natural for testosterone to fluctuate, but sleep, diet and other factors can affect a man's levels on a daily basis.