Nutramax Cosequin ASU Joint Health Horse Supplement is an original formula from the #1 veterinarian recommended brand for joint support. It has trademarked glucosamine and chondroitin formulations along with ASU, which is derived from avocados and soybeans. This potent active ingredient protects cartilage and supports joint mobility. ASU works synergistically with glucosamine for the most comprehensive joint support available for horses. In addition, this powerhouse formula contains high-purity MSM, an ingredient suggested by veterinarians to help manage joint health.