Chaste Tree Berry increases the progesterone side of a cycle. It is for periods that cycle under 28 days. It can help PMS, menopause, hot flashes, and can help to normalize a period if coming off birth control pills. It can also aid women with anterior pituitary disorders that produce milk unrelated to nursing.
Chaste Tree Berry helps the egg to fully mature and insures a healthy egg and corpus leteum (which manufactures progesterone).