Progesterone Affects During Luteal Phase and Into Pregnancy

I've been researching the affects of progesterone in our bodies, particularly focusing on the affects during the luteal phase. Here is a compilation of the things I've read it does (note that some of the pages I’ve linked to are long, to find the references on the individual pages use your browser’s search function (CONTROL+F in Windows/IE), to locate key words. I suggest starting first with “progesterone” and then going for specifics such as “endometrium”)

Affects of Progesterone During Luteal Phase

• Maintains endometrial lining during luteal phase, and into pregnancy in the presence of a fertilized egg (blocks collagenase from breaking down endometrium(PDF))


• Changes endometrial lining surface to be more receptive of the fertilized egg; causes the surface to have a more mucus like coating; causes glycogen bubbles to occur in endometrium which provide energy for the fertilized egg


• Promotes the endometrial glands to become enlarged, undergo maximum secretory activity and its blood vessels become coiled and enlarged.


• Prevents the woman’s body from rejecting the fertilized egg, stops rejection of fetal (foreign) DNA


• Reduces certain types of prostaglandin production to reduce uterine contractions making the uterus more hospitable to the fertilized egg/embryo (“progesterone block”)


• Affects blood sugar levels


• Affects zinc and copper levels (1),(2)


• Stimulates growth of breast tissue


• Facilitates thyroid function


• Raises body temperature about .5 degrees Centigrade (0.9 degrees F.)


• Causes relaxation of smooth muscle cells throughout the body (1), (2)


• Facilitates egg transport through the fallopian tube

Another list of functions of progesterone