Chaste tree has a progestogenic effect on the body and on the pituitary gland.  This helps to balance ovarian estrogen and progesterone production during the monthly cycle thus reducing the effects of PMS.  It may also be beneficial for infertility depending on the cause of the problem. If taken for a few months the benefits accumulate and benefit symptoms like abdominal bloating, breast swelling and tenderness, depression,  irritability, fluid stagnation in the knee joints, and skin problems that can all be related to PMS. Chaste trees can help to balance irregular menses as well and relieve complaints such as acne and migraines due to monthly cycles.  In some cases, it has even corrected problems with breastfeeding by stimulating the production of breast milk.