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'''Estrogen''' is a [[hormone]] produced by the [[follicles]] used to prepare the [[uterus]] for the reception of a fertilised [[egg (human)|egg]]. <ref>http://www.paternityangel.com/Articles_zone/How_it_happens/How-1.htm</ref> It is considered to be one of the primary female hormones just as [[testosterone]] is in males.

*estrogen receptors located in the hypothalamus serve as a master switch to control food intake, energy expenditure and body fat distribution <ref>httphttps://www.sciencedaily.com/releases/2007/08/070820145348.htm</ref>*The woman's [[ovaries]] produce most estrogen hormones, although the adrenal glands also produce small amounts of the hormones. <ref>http://www.healthsystem.virginia.edu/uvahealth/adult_gyneonc/estrogen.cfm</ref> There are several types of estrogen:*Estradiol (main form of estrogen)*Estriol (large amounts during pregnancy)*Estrone (predominate in post-[[menopause|menopausal]] women) Several artificial forms such as ethinyl-estradiol have been manufactured for use in oral [[contraceptive]] devices. These are often delivered via esters, such as menstrone.