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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.
What is progesterone? Progesterone is a hormone produced by the ovaries that helps prepare the uterus for pregnancy. It is first produced by the corpus luteum in the ovaries and later is maintained by the placenta. What does progesterone do? Helps to regulate the menstrual cycle. Prepares the lining of the uterus for implantation.