Nafoxidine (Paperback)

High Quality Content by WIKIPEDIA articles! Estrogens (AmE), oestrogens (BE), or strogens, are a group of steroid compounds, named for their importance in the estrous cycle, and functioning as the primary female sex hormone. Their name comes from estrus/oistros (period of fertility for female mammals) + gen/gonos = to generate. Estrogens are synthesized in all vertebrates as well as some insects. The presence of these steroids in both vertebrate and insects suggests that estrogenic sex hormones have an ancient evolutionary history. Estrogens are used as part of some oral contraceptives, in estrogen replacement therapy for postmenopausal women, and in hormone replacement therapy for trans women.