Arthri-Flex® is the latest development in joint support formulas from studies on joint nutrition science. Arthri-Flex® combines Glucosamine Sulfate and MSM(Methylsulfonylmethane) with FLEXICOL™ (a blend of premium Type II Chicken Sternum Collagen [containing naturally occurring Chondroitin Sulfate], Hyaluronic Acid and other synergistic herbal extracts and mineral compounds) to support both joints and cartilage. This is the most advanced formula in the world for the relief and natural treatment of Osteo-Arthritis, all kinds of joint pains due to worn out cartilage in the knees. It repairs and rebuilds cartilage. Try it and see pain go away, naturally of course with no side effects.