No. None of our ingredients are preserved with ethoxyquin or any other artificial preservative. We use natural antioxidants, such as mixed tocopherols. Fromm was involved in the initial work, many years ago, to test the effectiveness of the first mixed tocopherol antioxidant. Our research concluded that tocopherols are just as effective, and in most cases better, at preventing oxidation and extending the shelf life of pet foods compared to those preserved with artificial preservatives.