Nearly 21 million Americans experience an adverse reaction or digestive issues when they ingest food that contains gluten. Gluten refers to the proteins that are found in wheat, rye, and barley and is naturally occurring in most bread, pasta, and baked goods. But, gluten is sometimes used as an additive in many products that you wouldn’t suspect to contain it such as salad dressings, soy sauce, soups, medications and even non-food items such as soaps, shampoos, and lotions.