![]() Quantitatively, estrogens circulate at lower levels than androgens in both men and women. Their presence in both vertebrates and insects suggests that estrogenic sex hormones have an ancient evolutionary history. Another estrogen called estetrol (E4) is produced only during pregnancy.Įstrogens are synthesized in all vertebrates and some insects. Estradiol, an estrane, is the most potent and prevalent. ![]() There are three major endogenous estrogens that have estrogenic hormonal activity: estrone (E1), estradiol (E2), and estriol (E3). Estradiol, the major estrogen sex hormone in humans and a widely used medicationĬontraception, menopause, hypogonadism, transgender women, prostate cancer, breast cancer, othersĮstrogen receptors ( ERα, ERβ, mERs (e.g., GPER, others))Įstrogen or oestrogen ( see spelling differences) is a category of sex hormone responsible for the development and regulation of the female reproductive system and secondary sex characteristics.
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