Doctor's Best Glucosamine/Chondroitin/MSM featuring OptiMSM supports joint structure, function and comfort A potent combination of three proven, purified ingredients that help build the cushy cartilage that serves as a shock absorber for your joints Each serving provides 1500mg of glucosamine sulfate, 1200mg of chondroitin sulfate, and 1000mg of MSM Non-GMO and Gluten Free