Cosequin Maximum Strength Plus MSM & HA contains glucosamine hydrochloride, sodium chondroitin sulfate, and methylsulfonylmethane (MSM). This combination of ingredients help support healthy cartilage. Each chewable tablet also contains hyaluronic acid (HA), a major component of synovial fluid, the substance that lubricates and helps to keep joints moving fluidly. Cosequin joint health supplements are brought to you by Nutramax Laboratories Veterinary Sciences.