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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 is an important hormone in a womanâs reproductive cycle. It is critical in maintaining the uterine lining so that an early pregnancy can grow normally. It is produced by the follicle (egg sac) that originally released the egg that fertilized and implanted in the uterus. Before ovulation, progesterone is found in low levels in the blood. After ovulation, it rises quickly, reaching a peak about 1 week after ovulation (which is also usually 1 week before the next period is expected).