Food Allergen Labels: Guidance & Free Template Download In the food industry there are 14 named allergens which must be declared if they are used as an ingredient in a food product. These are the allergens that need to be labelled on the food products that you produce and/or sell. The 14 allergens that must be declared are: 1. Celery and celeriac. 2. Cereals containing gluten. 3.