Science-Based Nutrition Helps Maintain Healthy Joints Dietary Supplements Non-GMO - Gluten Free - Soy Free Helps Maintain Strong, Healthy and Flexible Joints Help Support and Maintain the Body Joints Helps Benefit Hair, Skin, Nails and Nails Doctor's Best Glucosamine Chondroitin MSM provides three important nutrients which help maintain healthy joints and connective tissues: glucosamine, chondroitin and Methylsulfonyl-methane (MSM, from OptiMSM). Glucosamine sulfate helps join health for lubrication and better joint movement and flexibility. Cartilage, composed of proteoglycans, is mainly located on bones and near Joints and consists primarily of collagen protein with side chains called chondroitin sulfate. MSM supplies bioavailable sulfur need for joint health. OptiMSM is purified via distillation for highest purity and consistency and is an excellent source of bioavailable sulfur.