Progesterone is secreted by the ovaries but ceases production at menopause. Progesterone protects against uterine and breast cancers, osteoporosis, fibrocystic disease and ovarian cysts. It dramatically decreases pre and post menopausal symptoms. Most U.S. physicians prescribe synthetic progestins which cause such side effects as bloating, headaches, fatigue and weight gain, and most recently associated with increasing the risk of cancer. The natural progesterone must be prescribed in place of the synthetic progestin to avoid the side effects and to protect against cancer. We emphasize the use of natural hormones and not synthetic hormones, which have been proven time and time again to cause significant side effects. Progesterone is very beneficial in treating premenstrual symptoms (PMS) such as mood swings and migraine headaches.