PetGuard Joint and Hip is a unique formulation of nutritional factors important for joint health and support. Because dogs may not naturally manufacture optimal amounts of Vitamin C, many veterinarians recommend supplementation of this important nutrient to maintain and support healthy connective tissue and joint structure. Non Acidic Ester C Calcium Ascorbate is a natural form of Vitamin C that allows tissues to absorb and retain high levels of the vitamin. Glucosimine and Chondroitin, widely used for treating arthritis, helps the body reduce the destructive enzymes within the joint while providing the basis for strengthening cartilage.