This bill proposes to amend the Federal Food, Drug, and Cosmetic Act by expanding the definition of a major food allergen to include gluten-containing grains. It specifically adds "gluten-containing grain" to the existing list of allergens, aiming to enhance consumer safety for individuals with celiac disease or gluten sensitivities. The legislation defines gluten-containing grain as wheat, rye, and barley, including their crossbred hybrids such as triticale. The amendment will apply to food introduced or delivered into interstate commerce 18 months after the bill's enactment, providing a transition period for compliance with the new labeling requirements.