Standardized Extract. With Dong Quai. Supports Endocrine Function. Chaste Berry has been traditionally used by herbalists for centuries; it is derived from the fruit of Vitex agnus-castus. More recently, scientific studies have indicated that Chaste Berry can support healthy endocrine function. The Chaste Berry extract in this formula is standardized to Agnusides, the active components of Chaste Berry. Dong Quai has been included to complete this women’s health support formula.