“Contains” vs. “may contain”: reading food allergen statements

A “Contains” statement identifies major food allergens used as ingredients in a packaged food. “May contain” or “shared facility” language is a voluntary precautionary statement about possible cross-contact; it is not a substitute for ingredient declaration or preventive controls.

Two statements, two different meanings

On a packaged food label, a “Contains” statement is one way to declare major food allergens that are ingredients. The allergen can also be identified in parentheses after its ingredient name. A precautionary statement such as “may contain” or “made in a facility that also processes” is voluntary language about possible unintended allergen cross-contact. It does not mean the allergen was intentionally added as an ingredient, and it does not guarantee that every risk has been assessed in the same way by every manufacturer.

What the ingredient declaration must do

Federal law requires the food source of major allergens used as ingredients to be declared on packaged foods covered by the law. For example, a product can identify “whey (milk)” in the ingredient list or put “Contains: Milk” next to the list. The “Contains” statement must not omit a major allergen that is used as an ingredient. Sesame is the ninth major allergen under the FASTER Act, effective for applicable packaged foods as of January 1, 2023. Always read the ingredient list and the allergen statement together.

Precautionary labeling is voluntary

A manufacturer may use “may contain” or similar wording to alert consumers to possible cross-contact. FDA does not require this advisory statement, and it should not be treated as a reliable substitute for allergen controls or as a complete inventory of every possible cross-contact pathway. An advisory statement also does not mean the allergen is an intentional ingredient. In food service, never assume that absence of “may contain” proves a meal is allergen-free; an establishment’s equipment, shared fryer, utensils, storage, or recipe changes create separate risks.

How a restaurant should use a package label

When using packaged ingredients, keep the label available to the PIC and staff who answer allergen questions. Check the label when receiving the product, after a supplier or recipe change, and when replacing a brand. Do not remove or discard packaging before key ingredient information is recorded or accessible. If the label includes a major allergen, update recipe and menu information and prevent cross-contact during preparation. If an advisory statement appears, follow the restaurant’s allergen policy and ask the PIC how it affects the menu item.

Made-to-order foods and packaged foods are different

The federal packaged-food labeling rules do not apply in the same way to every made-to-order meal wrapped at the point of purchase. State or local menu-labeling, allergen-disclosure, or food code rules may still require staff knowledge and accurate communication. A restaurant should maintain written recipes, identify major allergens in each menu item, and train staff on how to respond to a guest’s allergy concern. A hand-written “allergen-free” note or verbal assurance should not override known shared equipment or ingredient risk.

Cross-contact prevention remains the operation’s responsibility

Use clean, sanitized work surfaces and utensils, segregate allergen-containing ingredients, store them in closed and identified containers, and prevent transfer through gloves, hands, fryers, cutting boards, or airborne powders. Wash hands and change gloves between tasks; gloves do not replace handwashing. A guest request requires staff to check recipe and preparation steps, not merely remove the visible ingredient. If the operation cannot safely prepare the dish, the employee should explain that honestly and involve the PIC.

When an ingredient or label is unclear

Do not guess based on a product name, old label, or prior package. Hold the product, contact the supplier or manufacturer through an approved channel, and notify the PIC. Preserve the package and lot information. If an allergen is discovered after a dish has been made or served, stop service of the item, alert the manager, and follow the incident procedure. If a guest reports a reaction, activate emergency procedures as appropriate and avoid speculating about cause.

A short label-reading example

A sauce label lists tahini (sesame) in the ingredient list and has no separate “Contains” line. The sesame source is still declared, so staff should treat the sauce as containing sesame. Another package says “may contain sesame” but does not list sesame as an ingredient. That is a precautionary statement about possible cross-contact, and the kitchen must still follow its allergen policy. Neither example authorizes a staff member to promise that a dish is safe without checking the complete recipe and preparation area.

Points to remember

• Use the exact product, source, jurisdiction, and process information rather than relying on assumptions.
• Document controls and escalate unclear or safety-sensitive situations to the person in charge.

How to use advisory statements responsibly

Voluntary phrases such as “may contain,” “made in a facility that also processes,” or “processed on shared equipment” are precautionary allergen labeling. They are not a substitute for required ingredient disclosure, sanitation, supplier verification, or controls against cross-contact. A package can include no advisory statement and still require careful handling. Conversely, a precautionary statement is not a guarantee that the product is safe for a particular customer. For retail packaged foods, verify the ingredient list and any required “Contains” declaration against the product formulation and current label. For restaurant meals, answer from the current recipe and supplier specifications, then explain what is known about shared equipment and preparation. Do not remove a supplier’s warning when transferring food to a secondary container; retain the label or a reliable copy. If ingredients change, replace outdated menu and allergen information before service. When a guest reports an allergy, follow the establishment’s escalation process and never guess or promise zero risk.

How to use advisory statements responsibly

Voluntary phrases such as “may contain,” “made in a facility that also processes,” or “processed on shared equipment” are precautionary allergen labeling. They are not a substitute for required ingredient disclosure, sanitation, supplier verification, or controls against cross-contact. A package can include no advisory statement and still require careful handling. Conversely, a precautionary statement is not a guarantee that the product is safe for a particular customer. For retail packaged foods, verify the ingredient list and any required “Contains” declaration against the product formulation and current label. For restaurant meals, answer from the current recipe and supplier specifications, then explain what is known about shared equipment and preparation. Do not remove a supplier’s warning when transferring food to a secondary container; retain the label or a reliable copy. If ingredients change, replace outdated menu and allergen information before service. When a guest reports an allergy, follow the establishment’s escalation process and never guess or promise zero risk.