4 oz - ZIN: 511189 - Vitex, or chaste tree berry, is a popular herb in Europe, where it is used to balance hormone levels. It addresses luteal phase defect, a common cause of menstrual abnormalities resulting in an increased ratio of estrogen to progesterone. Common symptoms of luteal phase abnormalities are heavy periods, abnormally frequent periods, a lack of menstruation, PMS and breast pain during the menstrual cycle. Vitex has also been studied for its effects in supporting infertility. References: . Balch, 1997; BHMA Scientific Committee, 1996; Hallowell, 1994; Hoffman, 1994; Tyler, 1993; Tyler, 1994; Wishard, 1995.