This Veterinarian formulated all natural active ingredient joint formula combines chondroitin sulfate & glucosamine to make the ultimate joint formula for your horse. Chondroitin sulfate and glucosamine HCl are known to supply and build glycosaminoglycans (GAGS) and collagen. These are essential for rebuilding cartilage and synovial fluid. It also contains essential antioxidants. Antioxidants are know to remove damaging free radicals. Great Apple Flavor.