Testosterone
![](/Images/godic/202502/02/Testosteron.svg4558.png")
![](/Images/godic/202502/02/Testosterone-from-xtal-3D-balls4558.png")
![Human steroidogenesis, showing testosterone near bottom.](/Images/godic/202502/02/Steroidogenesis.svg4558.png")
![Hypothalamic–pituitary–testicular axis](/Images/godic/202502/02/Hypothalamus_pituitary_testicles_axis4558.png")
Testosterone is a steroid hormone from the androgen group and is found in humans and other vertebrates. In humans and other mammals, testosterone is secreted primarily by the testicles of males and, to a lesser extent, the ovaries of females. Small amounts are also secreted by the adrenal glands. It is the principal male sex hormone and an anabolic steroid.