All Natural Dog Supplement!Helps promote synovial fluid to lubricate joints and collagen formationProvides relief for working, senior, or athletic dogs that have arthritis or other joint problems Nupro Joint Supplement is an all natural supplement that is beneficial for dogs that may have stiff or sore joints. Every scoop provides the optimum dose of Glucosamine Complex, MSM and Ester C for the maximum benefit of your pet.