Feature Summary Extra Strength! Glucosamine and chondroitin treat the underlying basis of osteoarthritis at the cellular level. MSM is a natural pain reliever and anti-inflammatory. It inhibits pain impulses along nerve fibres, helping to reduce pain and muscle spasms. This formula contains 500 mg of glucosamine and 400 mg each of chondroitin and MSM. Main selling features •Meaningful amounts of glucosamine (500 mg), chondroitin (400 mg), MSM (400 mg) per tablet •With OptiMSM®, clinically studied form of MSM Ingredients Each Tablet Contains: Glucosamine Sulfate (Potassium chloride from shrimp/crab exoskeleton) 500 mg Chondroitin Sulfate (Sodium from bovine cartilage) 400 mg MSM (Methylsulfonylmethane) 400 mg Non-medicinal ingredients Microcrystalline cellulose, croscarmellose sodium, purified water, coating (methylcellulose, glycerin), stearic acid, vegetable grade magnesium stearate (lubricant).