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Progesterone. Print | Email article to a friend | Last updated: January 14, 2015. Progesterone is a hormone released by the corpus luteum in the ovary. It plays important roles in the menstrual cycle and in maintaining the early stages of pregnancy. It may also be involved in the growth of certain cancers.
When many of us think of progesterone, we think of it as being a hormone strictly for women. However, men need progesterone too. Progesterone helps to counteract the effects of estrogen on the male body. Not only is progesterone found in males, but men rely on the alleged female hormone to preserve their masculinity. In fact, progesterone is a precursor to testosterone - the male sex hormone.