USDA Vitex Agnus Castus Herbal Supplement Non-Irradiated Kosher Certified by QAI Chaste tree berries are often used as a female tonic. They benefit both the body and the mind through their balancing and normalizing properties, and they're often used for support during change-of-life periods. Chaste tree berries are the fully ripe, dark red fruits harvested in the fall.