Cosequin Maximum Strength Plus MSM contains glucosamine hydrochloride . sodium chondroitin sulfate . and methylsulfonylmethane (MSM). This combination of ingredients help support healthy cartilage. Cosequin joint health supplements are brought to you by Nutramax Laboratories Veterinary Sciences . the #1 veterinarian recommended supplement company. *Source: Among retail brands. Survey conducted among small animal veterinarians who recommended oral joint health supplements. *Source: Survey conducted among small animal veterinarians who recommended animal supplements.