What the U.S. Food Allergen Labeling Law Really Requires

If you have food allergies—especially common allergies like peanuts and milk—you probably have noticed that food labels specifically list whether the foods in question contain any allergens. That's because a law known as the Food Allergen Labeling and Consumer Protection Act of 2004 (FALCPA) requires manufacturers to clearly list the eight most common food allergens on product labels.

Commonly referred to as the Food and Drug Administration (FDA) food labeling law, it's designed to make it easier for people living with food allergies to identify foods they can have, along with those they should avoid.

Under FALCPA, food manufacturers need to list ingredient names in plain English, both in the ingredients list and below the ingredients list, under a heading that reads "Contains."

Nut allergy warning on packaging
 Peter Dazeley / Photographer's Choice / Getty Images

How Allergens Appear on Labels

Eight specific food allergens are covered by the law:

  • Milk
  • Eggs
  • Fish (e.g., bass, flounder, and salmon)
  • Shellfish (e.g., crab, lobster, and shrimp)
  • Tree nuts (e.g., pecans and almonds)
  • Peanuts
  • Wheat, and
  • Soybeans

According to the FDA, these are the allergens that cause the most problems in the U.S. Foods that contain these allergens need to list them in the ingredients label on the package. In addition, manufacturers must use use the “common or usual name” of the allergen. For example, “egg” must be called "egg" on food labels instead of “ovalbumin.” The warning must be listed in the same size type as the rest of the ingredients on the label. The common name must appear either:

  • In parentheses after the ingredient name. For example: “ovalbumin (egg),” or
  • After or next to the ingredient list, with the word “contains.” For example: “Contains: egg”

Exceptions to FALCPA

There are some exceptions to the law involving specific allergens.

There are two exceptions to FALCPA that are specific to soy: manufacturers do not have to label a product "contains soy" if the product only contains refined soy oil, or if it contains soy lecithin that has been used as a release agent.

Raw Agricultural Commodities

FALCPA does not apply to "raw agricultural commodities"—fruits and vegetables in their natural state (as you would find them loose in the produce section, for example). Therefore, these do not need to be labeled.

The law also does not cover eggs, milk, or meat, which are regulated by the U.S. Department of Agriculture, rather than by the FDA.

Because of these loopholes, raw fruits and vegetables may be sprayed with pesticides that contain allergens (most commonly, soy oil.) Raw chicken may be processed in water or broth that contains major allergens (once again, most commonly, soy, but also possibly wheat). Manufacturers are not required to print allergy warnings on raw chicken.


FALCPA defines crustacean shellfish as one of the big eight allergens, but does not include mollusks. This means manufacturers are not required to list the presence of clams, oysters, mussels, scallops or other mollusks in ingredient lists. If you are allergic to crustacean shellfish, it's possible you may have a sensitivity to mollusks as well.

What Does “May Contain” Mean?

If you see the following statements on a label, the food may be cross-contaminated with a big eight food allergen. These warnings are voluntary, so some manufacturers may not include this information. The only way to know if there is a chance of cross-contamination is to call the manufacturer of the product.

  • "may contain…"
  • "produced on shared equipment with…"
  • "produced in a facility that also processes…"

A Word From Verywell

You always should double-check the food label, even on a product that you've purchased in the past and found to be safe. Ingredients and processing can change at any time. For example, many candy manufacturers process holiday candy on different equipment, and that equipment can be shared with products that contain allergens.

Also, note that restaurants don't have to provide food allergy warnings, so never assume that you can eat a dish in a restaurant just because the presence of allergens isn't disclosed.

If you're struggling with how to manage your food allergy, talk to your healthcare provider about getting a referral to a dietitian. That person can help you identify foods that are safe for you to consume (along with those that aren't safe).

Verywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our editorial process to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy.
  • U.S. Food and Drug Administration. Guidance for Industry: Guidance on the Labeling of Certain Uses of Lecithin Derived from Soy Under Section 403(w) of the Federal Food, Drug, and Cosmetic Act.

  • U.S. Food and Drug Administration. Food Allergies: What You Need to Know.
  • U.S. Food and Drug Administration. Guidance for Industry: Questions and Answers Regarding Food Allergens, including the Food Allergen Labeling and Consumer Protection Act of 2004 (Edition 4); Final Guidance. October 2006.

By Jeanette Bradley
Jeanette Bradley is a noted food allergy advocate and author of the cookbook, "Food Allergy Kitchen Wizardry: 125 Recipes for People with Allergies"