Cosequin A.S.U Joint Health A division of Nutramax Laboratories veterinarian-recommended brand Cosequin produces scientifically researched nutritional joint health s for pets. Keep your equine companion running and mobile with Cosequin A.S.U Joint Health . This tasty powder contains glucosamine hydrochloride sodium chondroitin sulfate avocado/soybean unsaponifiables (A.S.U) and methylsulfonylmethane (MSM) to help maintain healthy joints and cartilage. Cosequin A.S.U Joint Health helps keep healthy horses comfortably active.