Pet Naturals of Vermont Daily Best Bone-Shaped 60 Count Chews,  X-large A balanced, comprehensive, high potency formula with digestive enzymes that helps to maintain optimum health in extra-large dogs Water and fat-soluble vitamins, including Vitamins A, C, D, E and a complete and balanced B complex Essential fatty acids and biotin to promote healthy skin and coat Antioxidants (Vitamins A,C,E, Selenium and zinc) to support the immune system Calcium, magnesium and the vitamins A, C, D and E to help maintain bone strength