Finding himself unable to perform was an alarming first for him. When Evans, a retiree who lives in Amherst, Ohio, told his doctor, he received a prescription for Viagra. That didn't help. At a follow-up appointment, he had some blood work done. It showed that his testosterone level had tanked, likely a side effect of one of the post-transplant medications he was taking. This time, his doctor sent him to a urologist, who prescribed a testosterone skin patch to boost the levels of the hormone in his blood. He's now been using patches for about five months.
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Testosterone is a hormone produced in the male testes. During a boy's pubescent years (ages 9 to 14), there is an increase in production that leads to male secondary sexual characteristics such as a deeper voice, more muscle mass, facial hair growth and enlargement of the Adam's apple (among others). Some teenage boys experience these puberty changes at later ages than others. The timing of puberty is often genetically determined (through heredity), but other factors can play a role in delaying it, such as poor nutrition, physical trauma and certain diseases. Stimulating testosterone production naturally is possible in teen boys, although in rare cases hormone therapy may be needed to trigger and complete puberty.