Tags: Drug.
Estradiol (E2 or 17β-estradiol also oestradiol) is a sex hormone. Estradiol is abbreviated E2 as it has two hydroxyl groups in its molecular structure. Estrone has one (E1) and estriol has three (E3). Estradiol is about 10 times as potent as estrone and about 80 times as potent as estriol in its estrogenic effect. Except during the early follicular phase of the menstrual cycle its serum levels are somewhat higher than that of estrone during the reproductive years of the human female.
