Testosterone

Testosterone belongs to the group of androgens and is the most important male sex hormone. It is formed in the so-called Leydig intermediate cells, which are located between the testicular tubules and the corresponding blood vessels.

Women also produce small amounts of testosterone in the ovaries and adrenal cortex. It increases the libido of the woman, but leads to a general masculinization or so-called virilization if there is an excess. In the male body, testosterone causes the development of sexual organs, the development of sexual characteristics (hair and fat distribution patterns, deep voice) and semen formation. In the male and female body, testosterone contributes to bone growth in the developmental phase, increases muscle mass and lowers blood cholesterol.

https://de.wikipedia.org/wiki/Testosteron _{(Wikipedia CC-by-sa-3.0)}