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Testosterone
Testosterone:  A steroid hormone produced predominantly in the testes of men but also in lesser amounts in the ovaries of women. Testosterone plays key roles in sexual function, libido, red blood cell production, bone health and quality of life. Hypogonadism with low testosterone is treatable with synthetic testosterone administered as a patch, gel or injection. On average, men produce about eight to ten times more testosterone than women.  Learn more.