Jarrow Formulas® Glucosamine+Chondroitin+MSM features glucosamine sulfate stabilized with potassium chloride (KCI). Glucosamine and chondroitin sulfate are fundamental components of hyaluronic acid in joint cartilage and synovial fluid.* Methylsulfonylmethane (MSM) is an organic source of sulfur, an antioxidant mineral and component of structural body tissues, such as cartilage.* Vitamin C and manganese support the synthesis of collagen and cartilage.*