Glucosamine/Chondroitin/MSM contains pure glucosamine sulfate, as confirmed by HPLC testing. Glucosamine sulfate is extracted from chitin, a long-chain polymer consisting of many glucosamine molecules linked together. Chitin forms structural frameworks in many living things, including aquatic crustaceans such as lobsters, crabs, and shrimp. In our formula, the glucosamine is purified and then sulfated and stabilized with potassium chloride.