In Canada, common allergens and gluten sources must always be clearly declared on food labels when present as ingredients or components of ingredients. They will appear in the ingredient list or in a "Contains" statement located immediately after the ingredient list.

Health Canada requires food manufacturers to clearly label products if the government’s “Priority Allergens” are among the ingredients. They are: peanut; tree nuts; soy; wheat; egg; milk; seafood (shellfish, fish, and crustaceans); sesame; sulphites; and mustard. By law, priority allergens are to be clearly labeled on the product.

Accurate and consistent allergen labeling is a legal requirement under Safe Food for Canadian Regulations (SFCR). They will appear in the ingredient list or in a “Contains” statement located immediately after the ingredient list.

Canadian labelling regulations require that the most common food, and food ingredients which can cause life-threatening or severe allergic reactions, are always identified by their common names so that consumers can easily recognize them on food labels.

If the packaged foods contain priority food allergens, gluten sources or added sulphites, they must be declared at least once in the list of ingredients. Priority food allergens, gluten sources, and added sulphites must be declared when they are part of, or a component of, an ingredient.