The most important estrogen is estradiol and the most important androgen is

The most important estrogen is estradiol and the most important androgen is testosterone.

Testosterone is the primary steroid male sex hormone. Its function is to control the development of male reproductive tissues, to promote secondary sexual characteristics to maintain health (the prevention of osteoporosis for example). It is synthesized from cholesterol and it achieves its effects by binding to androgen receptors on different tissues.