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Progesterone

Progesterone is a hormone produced in the ovaries during the second half of the menstrual cycle that helps prepare the uterus for pregnancy. Progesterone is also produced by the placenta during pregnancy and helps the placenta function properly.

At the end of pregnancy, a drop in progesterone helps start labor contractions.

When a woman reaches the end of her reproductive years and begins menopause, her level of progesterone declines.

By Healthwise Staff
Primary Medical Reviewer Kathleen Romito, MD - Family Medicine
Specialist Medical Reviewer Carla J. Herman, MD, MPH - Geriatric Medicine
Last Revised May 4, 2010

WebMD Medical Reference from Healthwise

Last Updated: May 04, 2010
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