The Chaste tree is native to the Mediterranean. The berries have long been used for female problems. It is a useful treatment for absent, infrequent and heavy menstruation. Agnus Castus balances the hormone prolactin which is produced by the ovaries after ovulation. It takes about 3 months for the hormone levels to normalize. Agnus Castus has beneficial effects in PMS as well by normalizing the release of hormones from the pituitary that controls the function of the ovaries.