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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.
Progesterone plays a key role in the production of other important chemicals the body needs, such as cortisol and male hormones like testosterone. Lower than normal levels of progesterone can contribute to problems with the menstrual cycle, maintaining pregnancy, and common symptoms associated with menopause.