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Testosterone causes the growth and pigmentation of the penis through LH-stimulated production in Leydig cells [1], and it facilitates physical changes during puberty, including growth of the penis [2].

Facts (2)

Sources

Reproductive Hormones endocrine.org Endocrine Society 1 fact

claimDuring puberty, testosterone facilitates physical changes in boys, including growth of the penis and testes, development of facial, pubic, and body hair, deepening of the voice, increased muscle and bone strength, and height growth.

Physiology, Male Reproductive System - StatPearls - NCBI Bookshelf ncbi.nlm.nih.gov National Library of Medicine 1 fact

claimLuteinizing hormone (LH) stimulates Leydig cells to increase testosterone production, which causes the growth and pigmentation of the scrotum and penis.