Glucosamine Chondroitin MSM Antioxidants For Dogs of All Sizes 6 Beneficial Ingredients Including All the Health Benefits of the Perna Mussel No Wheat No Corn No Artificial Ingredients Veterinarian Formulated Quality Seal - NASC Delicious. Different. Your dog deserves the best pet supplement the world has to offer. That's what's in this package. Every Pet Naturals supplement is naturally formulated with the most pure and potent ingredients available. Why It Works Glucosamine - Supports lubrication of the joints, flexibility and mobility Perna - Ingredients naturally found in perna enhance the healthy functions of joint and connective tissue MSM - A source of sulfur, which supports maintenance of connective tissue function Antioxidants - Support protection of the joints from everyday free radical damage