Made With Non GMO Ingredients Bone & Joint Formula Dietary Supplement PureFlex OptiMSM Gluten FreeBluebonnet's Glucosamine Chondroitin Sulfate Plus MSM Capsules are specially formulated with a special combination of pure glucosamine sulfate, chondroitin sulfate, OptiMSM and active form of sulfur, plus vitamin C from Identity-Preserved (IP) L-ascorbic acid. Available in easy-to-swallow vegetable capsules for maximum assimilation and absorption.