[Pink.Chiffon]

I found another really good website that summarizes the different roles hormones play in the female body.

http://womeninbalance.org/about-hormone-...mones-101/

Here is an excerpt that I think answers the question posed in the title of the thread:

Progesterone is made primarily by the ovaries. The adrenal glands, peripheral nerves, and brain cells produce lesser amounts. Progesterone ensures the development and function of the breasts and female reproductive tract. In the brain, progesterone binds to certain receptors to exert a calming, sedating effect. It improves sleep and protects against seizures.

Progesterone is also a diuretic. It enhances the sensitivity of the body to insulin and the function of the thyroid hormones. It builds bone and benefits the cardiovascular system by blocking plaque formation in the blood vessels and lowering the levels of triglycerides. Progesterone also can increase libido and contribute to the efficient use of fat as a source of energy.

Again, I think this highlights the importance of hormones being in normal range for effective NBE.