As defined by Wikipedia, progesterone is a C-21 steroid hormone involved in female menstrual cycle, pregnancy and embryogenesis of humans and other species. UltraPMS is a great site in getting information in women’s health as well as making people to understand the types of products which relives and prevents symptoms of PMS, perimenopause and menopause. Personally, I do not feel that these are something private because suitable use of products will help to ease the problems which might occur rather than not making any effort to know anything that may help.