To understand what progesterone does inside the human body, you should recognize that the hormone is important for the processes of ovulation and menstruation. Beyond that, it plays a large role in preparing for and maintaining pregnancies and keeping sex drives high. The ovary releases progesterone roughly two weeks after a woman has begun a menstrual cycle. Its function is to trigger the release of proteins that are essential for the endometrium, or lining of the uterus, to handle pregnancy. These proteins make it possible for the endometrium to hold onto a fertilized egg [source: Healthy Women].
If a fertilized egg successfully implants, then the placenta produces more progesterone. Normally, a woman experiences about 20-25 mg of progesterone during her cycle, but during pregnancy, the levels increase to 10 times that [source: Progesterone, WebMD]. The body needs the increased amount of progesterone to both prevent the release of other eggs and foster the growth of breast-milk glands [source: Healthy Women].
Reportedly, progesterone creams have the same chemical makeup that the hormone progesterone has. Therefore, when we talk about what progesterone does in the body, manufacturers of progesterone cream want you to believe the same can be applied to their products. The only difference is how the cream and the hormone are sent through an individual's system. According to label directions, in order to work properly, the cream must be absorbed through the skin into the body [source: Whole Health MD].
Read on to the next page in order to learn about the benefits that you might see when you use progesterone cream.