Male and female reproductive organs are the primary sources of testosterone production. This hormone is responsible for the development of sexual characteristics like muscle mass and bone density. It plays a vital role in the development of male reproductive organs, such as the testes and prostate.

Huo, S., Scialli, A. R., McGarvey, S., Hill, E., Tügertimur, B., Hogenmiller, A., Hirsch, A. I., & Fugh-Berman, A. (2016). Treatment of Men for “Low Testosterone”: A Systematic Review. PLoS One, 11 (9). http://dx.doi.org/10.1371/journal.pone.0162480