Johnsons 4Joints Extra Strength Liquid is a nutritional supplement to help support joint health. Ideal for easing stiffness, discomfort and helping to improve mobility, Johnsons 4Joints Extra Strength Liquid is a water soluble supplement containing Glucosamine, Chondroitin, Omega 3, Green Lipped Mussel and a range of vitamins to offer older cats and dogs a better quality of life.