Undeclared allergen recalls: why they are the most common food recall

Updated November 2, 2026 · By the PantryRecall team

An undeclared allergen recall means a product contains a major food allergen that is not listed on its label. For most shoppers the product is safe to eat. For someone with that allergy it can cause a severe or even life-threatening reaction, which is why these recalls are often Class I.

In our data: 549 of the 1519 FDA food recalls in the last three years (36%) involved an undeclared allergen, more than any other reason.

The nine major food allergens

U.S. law requires labels to declare these nine allergens: milk, eggs, fish, crustacean shellfish (such as shrimp and crab), tree nuts, peanuts, wheat, soybeans, and sesame. Sesame was added on January 1, 2023 under the FASTER Act.

How undeclared allergens happen

• The wrong label or wrong packaging is used for a product.
• An ingredient supplier changes its recipe and adds an allergen.
• Shared equipment is not cleaned properly between products.
• A label lists an ingredient by a name that hides the allergen, such as “whey” without saying milk.

If you or your child has a food allergy

• Check the allergen named in the notice; the product is only a risk for people allergic to that ingredient.
• Return or discard matching products even if you have eaten them before without a reaction. The recalled lot may be different.
• Follow your allergy action plan and seek emergency care for signs of anaphylaxis, such as trouble breathing or swelling of the throat.