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What is Testosterone?

Testosterone is a crucial steroid hormone belonging to the androgen group, primarily found in males and produced in the testes. It plays a fundamental role in the development of male reproductive tissues, as well as the maintenance of secondary sexual characteristics like facial hair, deep voice, and muscle mass. In addition to its primary functions, testosterone has diverse effects on various body systems, including the reproductive, musculoskeletal, cardiovascular, and central nervous systems. It influences sexual development, sperm production, bone density, muscle growth, mood regulation, and cognitive function.


1. Nassar GN, Leslie SW. Physiology, Testosterone. [Updated 2023 Jan 2]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2023 Jan-. Available from:

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