In the production of petfoods no different than human foods ”there are a number of compounds that make their way into the food that aren't a part of the formula/recipe or stated on the ingredient listing. This is nothing underhanded or disingenuous, merely a function of the process, package and regulations. These compounds are often called processing aids because they make production of the food more effective. They appear in minute incidental quantities and do not impart any value to the food
Examples include things like carriers, flow aids and release agents. Other compounds in food may come from agents used in food contact surfaces such as detergents and biocides used in sanitation, gases used to flush oxygen from packages or barrier films impregnated with antioxidants to improve shelf-life.
