Testosterone is a hormone that belongs to a class of hormones called androgens. It is primarily produced in the testes in males and in smaller amounts in the ovaries in females, as well as in the adrenal glands of both sexes. Testosterone plays a critical role in the development and maintenance of male sex characteristics, such as the growth of body hair, deepening of the voice, and development of muscle mass and strength.
In addition to its role in male sexual development, testosterone also plays a role in other bodily functions, including the regulation of bone density, the production of red blood cells, and the maintenance of muscle and tissue health. Testosterone also has a role in the development and maintenance of cognitive function and mood.
Testosterone levels can be affected by a variety of factors, including age, stress, illness, and certain medications. Low testosterone levels can cause a range of symptoms in men, including reduced sex drive, erectile dysfunction, fatigue, and mood changes. Testosterone replacement therapy may be used to treat low testosterone levels, although it is not without risks and should be used only under the guidance of a healthcare provider.