Denmark, Finland, Norway and Sweden collaborated during 2015 in a control project on allergen labeling. Products were also analysed for the allergens milk, egg, hazelnut, peanut and gluten. Correct labeling is the only aid for allergic consumers to avoid products which could pose a serious health risk. The widespread use of non-regulated precautionary allergen labeling (PAL) might decrease the amount of products available for allergic consumers. It can also pose a risk since the PAL might be ignored. On 10% of the controlled products, the allergenic ingredients were not correctly transcribed in the list of ingredients and EU regulations were thus not followed. Milk was the most frequently found undeclared allergen, especially in chocolate and bakery products, and therefore constitute a risk for allergic consumers. The results might give input to achieve EU legislation regarding PAL.