Chasterberry PMS Support by Morphogen Nutrition Chasterberry Extract by Morphogen Nutrition is a PMS Support supplement for women needing support with premenstrual syndrome (PMS). Chastberry extract (Vitex agnus-castus) has been used for centuries to help alleviate symptoms associated with PMS. Chasterberry PMS Supp Facts Chastberry extract (Vitex agnus-castus) has been used for centuries to help alleviate symptoms associated with premenstrual syndrome. Has been shown to be effective at reducing hot flashes, bloating, irritability, sleep disturbances, depressions, various mood disorders and cramping. Reduces prolactin levels and increases beta-endorphins. Reduced prostate cancer risks in men. Common dosing is 150-250mg up to four times per day. CHASTEBERRY contains 250mg Vitex agnus-castus per serving.