Food Allergen Labeling and Compliance Under U.S. Law

Federal food allergen labeling requirements apply to packaged foods under FDA jurisdiction and require manufacturers to disclose any of nine major allergens by their plain food-source name, either in a “Contains” statement immediately after the ingredient list or in parentheses next to the ingredient itself. The obligation comes from the Food Allergen Labeling and Consumer Protection Act of 2004 (FALCPA), expanded by the FASTER Act of 2021, and is enforced through the misbranding provisions of the Federal Food, Drug, and Cosmetic Act. A label that hides an allergen behind a technical name, or omits it entirely, makes the product illegal to sell and exposes the company to recalls, seizures, and criminal prosecution.

The Nine Major Allergens Covered by Federal Law

FALCPA originally named eight food groups: milk, eggs, fish, crustacean shellfish, tree nuts, peanuts, wheat, and soybeans. Together they accounted for roughly 90 percent of serious allergic reactions in the United States at the time of enactment.¹ The FASTER Act added sesame in 2021, and current federal law reflects all nine.²

Generic category names do not satisfy the rule. A label cannot just say “tree nuts.” It has to name the specific nut: almonds, cashews, pecans, walnuts, and so on. Fish and crustacean shellfish work the same way, so you’ll see “cod” or “shrimp” rather than a group label. The FDA publishes a specific list of tree nuts it treats as major allergens, and a tree nut not on that list belongs in the ingredient list under its common name but not in a “Contains” statement.³

How the Allergen Must Appear on the Package

Under 21 U.S.C. § 343(w), a packaged food that contains a major allergen is misbranded, and unlawful to sell, unless the allergen is disclosed by one of two methods.⁴

The first method is a “Contains” statement. The word “Contains” is followed by the food-source names of each allergen present, printed immediately after or next to the ingredient list, in type at least as large as the ingredient list itself.

The second method is parenthetical disclosure inside the ingredient list. The food source appears in parentheses next to the ingredient it comes from, as in “casein (milk)” or “lecithin (soy).” If the common ingredient name already identifies the allergen, for example “nonfat dry milk,” no parenthetical is needed.

Both methods share the same purpose: the allergen has to be identified by a plain food name a consumer can recognize, not a technical or chemical term. Listing “casein” without also identifying it as a milk protein makes the label noncompliant.⁴

What the Labeling Rules Do Not Cover

Not every ingredient derived from a major allergen triggers disclosure. The statutory definition of “major food allergen” in 21 U.S.C. § 321 carves out highly refined oils, meaning refined, bleached, and deodorized oils, from peanuts, soybeans, and similar sources, along with ingredients derived from those oils. The refining process removes the proteins that cause allergic reactions.⁵

Raw agricultural commodities also sit outside the allergen labeling rules. Fresh fruits, vegetables, and certain unprocessed seafood sold in their natural state are not subject to the “Contains” statement or parenthetical requirements. Shell eggs are governed by separate hygiene rules.³

Any other ingredient derived from a major allergen is exempt only if it contains no protein from that allergen source. If allergenic protein is present, it must be declared no matter how processed or diluted the ingredient is.⁵

Products Regulated by Other Agencies

FALCPA reaches packaged foods under FDA jurisdiction. Two large product categories fall elsewhere and follow different rules.

Meat, poultry, and processed egg products are regulated by the USDA’s Food Safety and Inspection Service. FSIS requires labels to declare all nine major allergens, which the agency refers to as the “Big 9.” Ingredients must be declared by common name, and allergen-derived processing aids must appear on the label even where they would otherwise qualify as incidental additives. FSIS inspectors verify compliance at the facility level through record review and observation.⁶

Alcoholic beverages are regulated by the Alcohol and Tobacco Tax and Trade Bureau under the Federal Alcohol Administration Act. Current TTB regulations do not require disclosure of major food allergens on wine, distilled spirits, or malt beverage labels.⁷ A beer brewed with wheat, or a wine fined with egg whites, carries no federal obligation to say so.

Federal law also does not require restaurants to label allergens on menus. Some states have imposed their own restaurant-level rules, but obligations depend on the jurisdiction rather than any federal mandate.

Voluntary “May Contain” Advisory Statements

Phrases like “may contain peanuts” or “produced in a facility that also processes tree nuts” are not required by federal law. They are voluntary, and the FDA does not regulate their format the way it regulates the mandatory “Contains” statement.¹

FDA guidance still sets some limits on how they can be used. An advisory statement is appropriate only when a manufacturer has already followed good manufacturing practices and taken reasonable steps to prevent cross-contact, but some unavoidable risk remains from shared equipment or airborne particles. A “may contain” label is not a substitute for real allergen controls. Advisory statements also have to be truthful: a company cannot label a product “may contain wheat” defensively if there is no actual cross-contact risk.¹

Contradictory labeling is a separate problem. A product should not carry both a “wheat-free” claim and a “may contain wheat” advisory, or pair a mandatory “Contains: peanuts” declaration with a “may contain peanuts” line for the same allergen.⁸

Gluten-Free and Wheat-Free Are Not the Same Claim

Wheat is a major food allergen, so wheat triggers mandatory FALCPA disclosure. Gluten is not one of the nine major allergens and has its own separate regulatory framework. Under 21 CFR 101.91, a “gluten-free” claim means the product either naturally lacks gluten or contains less than 20 parts per million. Gluten comes from wheat, rye, barley, and their crossbred hybrids like triticale.⁹

The practical result is a mismatch consumers need to watch for. A product labeled “wheat-free” may still contain gluten from rye or barley. A product labeled “gluten-free” may still trigger a wheat allergy if it was processed to remove gluten but retains other wheat proteins. The “gluten-free” label is voluntary, and the FDA does not define “wheat-free” at all.⁹

Manufacturing Controls Behind the Label

A correct label is only part of compliance. The Food Safety Modernization Act (FSMA) requires food facilities to build allergen controls into operations rather than rely on end-product testing. Every covered facility must develop and maintain a written food safety plan with a hazard analysis identifying allergen risks in the production environment.¹⁰

The plan must include written allergen controls: specific procedures to prevent cross-contact and to make sure labels accurately reflect the finished product. In a facility running both peanut butter crackers and plain crackers on the same line, the cleaning protocol between runs has to be documented, performed consistently, and verified. Employee training is a binding obligation under FSMA. Everyone who manufactures, processes, packs, or holds food must be qualified for the role and trained in food hygiene and safety, including allergen awareness appropriate to the operation. Facilities must keep records of monitoring, corrective actions, and verification, and must have a written recall plan ready when the hazard analysis calls for one. All of these records have to be available for FDA inspection.¹⁰

Enforcement When Labeling Fails

A packaged food that fails to disclose a major allergen is misbranded under federal law, and the FDA has several tools to respond.⁴ The usual first step is a warning letter, which creates a public record and gives the company a deadline to respond, generally 15 working days.¹¹ If the company does not fix the problem, the FDA can seize the products.

For situations where a mislabeled product could cause serious illness or death, the FDA has mandatory recall authority under 21 U.S.C. § 350l. The statute specifically covers food misbranded under the allergen labeling provision at section 343(w) when there is a reasonable probability the product could cause serious health consequences. The agency has to give the company a chance to recall voluntarily first, but if the company refuses or delays, the FDA can order distribution to stop immediately.¹²

Selling misbranded food is a prohibited act under 21 U.S.C. § 331, and criminal penalties follow under § 333. A first offense carries up to one year in prison and a fine of up to $1,000. If the violation involves intent to defraud or mislead, or if the person has a prior conviction, the maximums rise to three years in prison and $10,000.¹³ The statutory dollar figures look modest on paper. The reputational damage of a criminal prosecution and the cost of a nationwide recall are what make allergen mistakes among the most expensive errors a food company can make.

A separate obligation runs through the Reportable Food Registry. When a responsible party determines that one of its products could cause serious health consequences or death, which covers many undeclared-allergen situations, it must file a report through the FDA’s electronic portal within 24 hours. The only exception is when the company catches the problem before the product leaves its own facility and either corrects the issue or destroys the product.¹⁴

1
U.S. Food and Drug Administration. Food Allergies
2
U.S. Food and Drug Administration. FASTER Act: Sesame is the Ninth Major Food Allergen
3
U.S. Food and Drug Administration. Questions and Answers Regarding Food Allergens, Including the Food Allergen Labeling Requirements of the Federal Food, Drug, and Cosmetic Act (Edition 5)
4
Office of the Law Revision Counsel. 21 USC 343 – Misbranded Food
5
Office of the Law Revision Counsel. 21 USC 321 – Definitions; Generally
6
USDA Food Safety and Inspection Service. FSIS Directive 7230.1 Rev. 4
7
Alcohol and Tobacco Tax and Trade Bureau. Major Food Allergen Labeling for Wines, Distilled Spirits, and Malt Beverages
8
U.S. Food and Drug Administration. Frequently Asked Questions: Food Allergen Labeling Guidance for Industry
9
U.S. Food and Drug Administration. Questions and Answers on the Gluten-Free Food Labeling Final Rule
10
U.S. Food and Drug Administration. FSMA Final Rule for Preventive Controls for Human Food
11
GovInfo. FDA Warning Letters: Timeliness and Effectiveness
12
Office of the Law Revision Counsel. 21 USC 350l – Mandatory Recall Authority
13
Office of the Law Revision Counsel. 21 USC 333 – Penalties
14
Office of the Law Revision Counsel. 21 USC 350f – Reportable Food Registry