From the Iditarod to the world of working dogs, Vertex canines consistently perform better. Predigested proteins, glucose polymers, lactic acid buffers, glucosamine, vitamin C & E, flax oil, biotin, creatine, zinc, ginseng, digestive enzymes, acidophilus and much more, all in one product. Feed your dog the best and safest supplements on the market. Pioneered in the human sports nutrition field, now you can feed your canine athlete like a human athlete. All dogs can benefit from the science backed research that goes into every Vertex product. 100% satisfaction guaranteed.