<unk>  <unk> , or<unk> , is one of the four natural estrogenic steroid hormones found in humans, along with estrone (E1), estradiol (E2), and estriol (E3),<unk>  is a major estrogen in the body. In contrast to estrone and estradiol,<unk>  is a native estrogen of fetal life.<unk>  is produced exclusively by the fetal liver and is found in dectable levels only during pregnancy, with relatively high levels in the fetus and lower levels in the maternal circulation. In addition to its physiological role as a native hormone,<unk>  can be used as a medication, see<unk>  (medication).<unk> , in combination with drospirenone, has recently been approved as a new estrogenic component of a combined oral contraceptive (COC) and<unk>  alone is in clinical development for the treatment of menopausal symptoms as well as breast and prostate cancer.
Estetrol
Gestodene
Hexestrol
Fosfestrol
Benzestrol
Moxestrol
Dimestrol
Dienestrol