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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.
Fertility and menstruation are largely controlled by hormones, and one of these hormones is progesterone. Understanding progesterone and what it does will help women make informed choices about their reproductive health. Progesterone is one of the progestogen steroid hormones. It is secreted by the corpus luteum, a temporary endocrine gland that the female body produces after ovulation during the second half of the menstrual cycle. Progesterone prepares the endometrium for the potential of pregnancy after ovulation.