In many clinical studies, chasteberry reduced a variety of PMS symptoms including breast pain and tenderness, edema, constipation, irritability, depressed mood, anger, and migraines .
In some cases, PMS symptoms can be caused by an excess release of prolactin from the pituitary gland. In other cases, it may be a result of an imbalance of estrogen to progesterone .
2) Female Fertility and Menstrual Cycle Disorders
In Germany, chasteberry is used to treat luteal phase disorders. This is the second half of the menstrual cycle, which is usually shortened in women with the disorder