Joint Power is for cats and dogs who experience discomfort or stiffness in their joints due to normal activity and exercise. Joint Power can also be used as a daily supplement to help keep your pet's joints, heart, eyes, skin, and brain as healthy as possible! The active ingredient in this product is 100% New Zealand Green Lipped Mussel, packed with Omega-3 fatty acids and Glycosaminoglycans that support joint mobility.