Chaste Berry Extract, also known as Vitex Agnus-Castus or Monk’s Pepper, is a powerful botanical that has been used since the Middle Ages, with benefits validated by modern clinical studies. Published research shows a 20 mg dosage supports healthy levels of prolactin and progesterone, which promotes menstrual cycle regularity. This helps reduce PMS associated discomfort, such as bloating, cramps, mood swings, and fatigue.