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In page Allergen:

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The United States Food and Drug Administration recognizes nine foods as major food allergens: peanuts, tree nuts, eggs, milk, shellfish, fish, wheat, soy, and most recently sesame,[3] as well as sulfites (chemical-based, often found in flavors and colors in foods) at 10ppm and over.[citation needed] In other countries, due to differences in the genetic profiles of their citizens and different levels of exposure to specific foods, the official allergen lists will vary. Canada recognizes all nine of the allergens recognized by the US as well as mustard.[4] The European Union additionally recognizes other gluten-containing cereals as well as celery and lupin.[5]