Ingredient

Allergen

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Source
Unknown
Not yet classified by editors
Allergen
No
Role in food
Allergens are not added ingredients; rather, they are components of the base ingredients used …

What it is

Allergens are substances in food that can cause an allergic reaction in some individuals. These reactions can range from mild to severe. The most common food allergens are proteins found naturally in foods.

Why it's used

Allergens are not added ingredients; rather, they are components of the base ingredients used in food production. For example, wheat is a common ingredient in baked goods, and milk is used in dairy products and many processed foods.

Health notes

The U.S. Food and Drug Administration (FDA) identifies eight major food allergens: milk, eggs, fish, crustacean shellfish, tree nuts, peanuts, wheat, and soybeans. Sesame was added as the ninth major allergen in April 2023. For individuals with food allergies, exposure to these allergens can trigger immune responses. Regulatory bodies like the FDA require clear labeling of major allergens on packaged foods to help consumers avoid them.

Allergen info

Allergens are defined by their presence in specific foods that are themselves major allergens. The FDA recognizes nine major food allergens: milk, eggs, fish, crustacean shellfish, tree nuts, peanuts, wheat, soybeans, and sesame.

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Last updated: September 28, 2026

Note: This site presents label data from USDA FoodData Central for general information. It is not medical advice. Check the package label; formulations change.