Benefits/Characteristics Vitex agnus-castus (often referred to as vitex) is a herb native to Mediterranean countries. The herbs popularity has increased significantly in recent years, with over 300 publications in the international literature on its mechanism of action. The vitex berries used in the preparation of the extract contain a wide range of phytochemically active substances, including flavonoids and a group of chemicals belonging to the iridoids, including aucubin and agnuside. The main indication for the administration of Vitex is premenstrual syndrome (PMS). PMS refers to a set of unpleasant organic and psychological symptoms that occur approximately 1-2 weeks before menstruation and are directly related to the hormonal changes observed during this period of the female cycle. Lamberts Vitex is a