Americans are more concerned about health than ever before, so we should also have an equal amount of concern for our pets ... particularly with regard to the ingredients in their food. We would want the ingredients in our pets' food to be acceptable for human consumption.After all, If byproducts are not tolerated in our food, why should they be tolerated in our pets' food? We're also starting to realize that our dogs and cats need daily supplements the same way that we do, in order to take care.