Vitex (Fructus viticis) is a small brow berry fruit of the chastetree which is about the size of peppercorns and smells likepeppermint.Chasteberry is an plant used for the treatment of menstrual problems. Women have used chasteberry for thousands of years to help reduce the symptoms menstrual problems and to stimulate the production of breast milk. During the middle ages, monks reportedly used chasteberry to decrease sexual desire and preserve chastity. Today, chasteberry is used to reduce the symptoms of PMS and menopause, to ease breast pain, for some types of infertility, and acne.