Glucosamine Chondroitin MSM provides three important nutrients that help support healthy joints and connective tissue: Glucosamine, Chondroitin, and Methylsulfonylmethane (MSM) from OptiMSM. Glucosamine Sulfate helps with joint health, joint lubrication, better joint movement and flexibility. * Cartilage is composed of proteoglycans, mainly located on bones and near joints. It is mainly composed of collagen protein, and the side chain is called chondroitin sulfate. MSM provides bioavailable sulfur needed to support joint health, hair, skin and nails. OptiMSM is purified through distillation to provide the highest purity and consistency and is an excellent source of bioavailable sulfur. *