Hawthorne Max-V vegetarian capsules provide a significant quantity of the flowering tops and berries of the hawthorn tree, Crataegus oxyacantha, Standardized to provide 4.5 to 5.5 mg vitexin. Rich in bioflavonoids, extract of hawthorn has been known for centuries as a potent cardiovascular tonic, improving the function of the heart and circulatory system.