Excuse my ignorance, but I didn’t what progesterone was until a few minutes ago when I looked it up to find out. Progesterone is a female hormone and is related to reproduction (periods, pregnancy and all that jazz.) It’s said taking additional progesterone has a range of health benefts even including reducing the risk of miscarriage and breast cancer. I’d be a little skiddish about taking a hormone, though really I’m not informed enough to judge accurately.