Oral contraceptive pill hormonal components Oral contraceptive pill hormonal components. All except endogenous hormones are synthetic steroids. Source: Female Reproductive Endocrinology and Infertility, Greenspan's Basic & Clinical Endocrinology, 10e Citation: Gardner DG, Shoback D. Greenspan's Basic & Clinical Endocrinology, 10e; 2017 Available at: http://accessmedicine.mhmedical.com/DownloadImage.aspx?image=/data/books/2178/gardgreen10_ch13_f019a-1.png&sec=166251027&BookID=2178&ChapterSecID=166250715&imagename= Accessed: October 23, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved