Cosequin Senior Soft Chews contain glucosamine hydrochloride, sodium chondroitin sulfate, and methylsulfonylmethane (MSM). This combination of ingredients help support healthy cartilage. Each soft chew also contains omega-3 fatty acids to help support skin & coat health and beta glucans for immune health. 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.