* Andrew Weil, M.D. * For Healthy Joint Support * Dietary Supplement Q: What can you tell me about glucosamine and chondroitin? A: Glucosamine sulfate is derived from the exoskeletons of shellfish. It provides joints with the building blocks needed to address changes from normal wear and tear. Chondroitin sulfate protects the cartilage and attracts fluids that give the tissue its shock-absorbing quality. Andrew Weil, M.D.