We want only the best for our customers, which is why we’ve put so much research into the ingredients the body needs, as well as the ones it doesn’t. One such ingredient is gluten, and it’s found in so many other protein bars and foods everywhere. Gluten is the protein found in wheat, barley, rye, and triticale. It is estimated that up to 3 million Americans have celiac disease, a condition in which gluten triggers an immune response that damages the lining of the small intestines. Gluten sensitivity can cause similar symptoms to celiac disease, but without the intestinal damage.