Duralactin contains MicroLactin, a patented, milk derived, high protein product from hyperimmunized cows that contains factors that appear to inhibit neutrophil participation in the inflammatory response1. Duralactin does not share the mechanism of action of any known drug and is not a cycloxygenase (COX-1 or COX-2) inhibitor. 1Zenk JL, Helmer TR, Kuskowski MA. The effects of milk protein concentrate on the symptoms of osteoarthritis in adults: an exploratory, randomized, double-blind, placebo-controlled trial. INDICATIONS: Duralactin is intended to be used as a nutritional aid for the management of chronic inflammatory conditions including musculoskeletal disorders in aging pets.