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| Testosterone comes primarily from the testes of males and the ovaries of females, with small amounts being secreted by the adrenal glands. On average, an adult male's body produces about twenty times the amount of testosterone that an adult female's body does. Testosterone's effects include anabolic effects such as growth of muscle mass and strength (testosterone is an anabolic steroid), increased bone density and strength, and stimulation of linear growth and bone maturation; and virilizing effects such as maturation of the sex organs, particularly the penis and the formation of the scrotum in fetuses, and after birth (usually at puberty) a deepening of the voice, growth of the beard and axillary hair. As with every hormone, testosterone has also been tried for many conditions and purposes besides replacement, with variable success and relatively high rates of side-effects or problems. |
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