Cosequin Maximum Strength Plus MSM & HA contains FCHG49 Glucosamine Hydrochloride, TRH122 Sodium Chondroitin Sulfate, and MSM (Methylsulfonylmethane). This combination of ingredients helps maintain your dog's cartilage and connective tissue. Each chewable tablet also contains Hyaluronic acid (HA), which provides viscosity to the synovial fluid, supporting joint function and reducing friction between joint surfaces.