Let’s talk about testosterone therapy for men. Testosterone is the major sex hormone, produced largely in the testes of men and is responsible for developing the primary and secondary sexual characteristics in males. Development of male sex organs, lean body mass (your muscles) and facial hair all are the result of testosterone production. In addition to the development of the male sex organs, testosterone is also responsible for controlling sexual drive and sexual function, sperm production and fat metabolism.

Hypogonadism

Male hypogonadism is a condition in which the body doesn’t produce enough of the hormone testosterone — the hormone that plays a key role in masculine growth and development during puberty.

Andropause
Andropause is the male version of menopause; however, it occurs more gradually, over a longer period of time than its counterpart. During andropause, men experience a gradual decline in testicular function and testosterone production. Many physiological and psychological changes occur during this time.
Between their mid-40s and early 70s, men experience a drop in testosterone of about 50%; however, it is often noted as young as 30. Men with reduced testosterone production have an increase in upper and central body fat, decreased muscle mass.