This page discusses progesterone, a hormone essential for preparing the body for pregnancy and maintaining it post-conception, primarily secreted by the corpus luteum and later the placenta. It highli...This page discusses progesterone, a hormone essential for preparing the body for pregnancy and maintaining it post-conception, primarily secreted by the corpus luteum and later the placenta. It highlights the role of progestins, synthetic derivatives used in various medical applications, including birth control.