"Artificial additives" refers to synthetic substances that are added to food, drinks, or other products to enhance their appearance, flavor, texture, or shelf life. Full definition
As an added bonus, it is free from artificial additives like colors, flavors, and preservatives. (pawster.com)
Usually only home made foods are prescribed in various food borne allergies because commercial dog foods contain artificial additives which are potentially the cause of the canine allergy skin reaction. (dog-health-handbook.com)