What is Androgen?

Androgens are a group of sex hormones. They control and are of crucial importance to the male characteristics of sexual and reproductive function. Also, they control secondary characteristics such as facial and body hair, and the development of bone and muscle. They are essential for reproductive health and function. The major sex hormone is testosterone, which is produced primarily in the testes. The level of testosterone is controlled by hormones from the pituitary gland, which is located in the brain.

What is Androgen Deficiency?

Androgen deficiency is the lack of a normal level of the sex hormones (androgens), primarily testosterone (hypogonadism). The deficiency may be mild or severe. As a man ages, the level of androgens present in his body naturally declines. At some point, the effects of the decreasing levels become apparent. Men differ individually in their starting levels and in their rate of decline. These age–related changes are in addition to any physical problems with brain function or health of the testes, or problems with brain areas such as the pituitary and hypothalamus that control the function of the testes. Treatment most often involves testosterone replacement therapy.