Myristol PRO joint and health supplements for horses contain Promutase 200. Promutase 200 is a blend of the antioxidants superoxide dismutase and catalase. Promutase 200 was added to Myristol to create a product that could both help horses that tend to get muscle sore, or be prone to myositis episodes. It was also added to aid in post-exertion recovery. Myristol PRO also contains the same joint health ingredients as Myristol, but cetyl myristoleate levels have been increased from 5000 mg to 6000 mg per serving in Myristol PRO. This makes Myristol PRO the leading equine joint health supplement available regarding levels of cetyl myristoleate.