Vet"s Best the widely trusted natural health care line for pets, has been applying natural science to its formulations for more than 28 years: Veterinarian-invented, natural ingredients and natural health systems. Vet"s Best uses only the highest quality natural ingredients across all of its formulas. Our Level 3 Advanced Hip and Joint is for the special needs of large breeds and senior dogs. Our gentle formula helps support normal, healthy cartilage, connective tissue and joint mobility. Glucosamine helps maintain synovial fluid that lubricates the joints. It also supports strong, healthy bones and the antioxidant properties help remove damaging free radicals.