Experts recommend testosterone replacement, starting during puberty, for proper development of muscles, bones, male sex characteristics such as facial hair, and sexual function. (hormone.org)
Testosterone is an important hormone, it is the primary male sex hormone and promotes secondary male sex characteristics such as voice deepening and hair growth patterns. (fitbodyhq.com)
Androgens are naturally occurring hormones — such as testosterone — that regulate the development and maintenance of male sex characteristics. (holtorfmed.com)