Vitex (chaste tree berry) has become one of the most widely relied-upon botanicals in American and European herbalism. Planetary Formulas Full Spectrum Vitex Extract combines a standardized extract of Vitex agnus-castus (chaste tree) berries, concentrated to 0.5% agnusides, with whole berries. Vitex modifies the effect of the hypothalamus and pituitary glands. This helps regulate and balance female hormone production. Combining these active constituents with the whole herb ensures that all the important compounds of the botanical are present.