Understanding Estrogen Estrogen is actually a class of hormones with three different subgroups: estrone, estriol and estradiol. This group of sex hormones is produced primarily by the ovaries in premenopausal women. Following menopause, estrogens are produced to some extent by the adrenal glands and by certain fat cells. More recently, synthetic forms of both estrogen and progesterone (examples are Premarin, PremPro, Progestin) have come into use. Estrone, also known as E1, is
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