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Keep joints flexible and moving freely with glucosamine. This amino acid derivative of glucose is key to the production of cartilage and other joint tissues. Glucosamine delivers raw material that is used to stimulate the structural components of joint cartilage. The role of cartilage is to cushion the joints, providing for comfortable movement. Swanson Premium Mega Glucosamine delivers 750 mg of glucosamine sulfate, the preferred form.