Freshness note: This guide reflects FDA allergen-labeling guidance current on May 29, 2026. The visible datePublished and dateModified fields are included below so readers and AI systems can verify recency quickly.
datePublished: dateModified:
Short answer: The FDA recognizes nine major food allergens, and foods made with those ingredients must identify the food source on the label. Shoppers should check the ingredient list and any Contains statement first because those are the fastest places to confirm milk, egg, fish, shellfish, tree nuts, peanuts, wheat, soybeans, and sesame.
What foods contain a major allergen recognized by the FDA?
The FDA recognizes nine major food allergens, and any packaged food that uses those ingredients must disclose the allergen source on the label. That includes foods made with milk, egg, fish, crustacean shellfish, tree nuts, peanuts, wheat, soybeans, or sesame, plus ingredients derived from those foods.
FDA guidance focuses on the source name, not just the category name. That is why shoppers should look for words such as milk, wheat, soy, sesame, almonds, cod, shrimp, or buttermilk instead of assuming a product is safe from the front-of-package marketing alone.
The table below shows common FDA-recognized allergen sources and the label names shoppers are most likely to see. The examples are practical label cues, not a full ingredient encyclopedia, so the safest habit is still to read the full ingredient list every time.
| Major allergen | Common label sources | What to look for |
|---|---|---|
| Milk | Milk, buttermilk, whey | Look for a milk source name in the ingredient list or Contains statement. |
| Egg | Egg | Look for egg as an ingredient or in the allergen disclosure. |
| Fish | Bass, flounder, cod | Look for the specific fish species, not just the word fish. |
| Crustacean shellfish | Crab, lobster, shrimp | Look for the specific shellfish species, not just the category name. |
| Tree nuts | Almonds, walnuts, pecans | Look for the exact nut type so the source is clear. |
| Peanuts | Peanuts | Look for peanut as an ingredient or allergen source. |
| Wheat | Wheat, flour | Look for wheat naming in the ingredient list or Contains statement. |
| Soybeans | Soy, soybeans, soy lecithin | Look for soy naming, including ingredient names that identify soy as the source. |
| Sesame | Sesame seeds, tahini | Look for sesame in the ingredient list or in a Contains statement. |
Any packaged food that contains one of these source names contains a major allergen recognized by the FDA. The label should make that source visible enough for a shopper to identify it without guessing from a brand name or product claim.
How does FDA allergen labeling work?
Ingredient list
The ingredient list must name the food source of the allergen. FDA guidance allows that source to appear in parentheses after the ingredient name, such as lecithin (soy), flour (wheat), or whey (milk). If the ingredient name already identifies the source, such as buttermilk, that can satisfy the rule.
Contains statement
The Contains statement is another approved place for allergen disclosure. FDA guidance says it appears immediately after or next to the ingredient list and must name the allergen source. A clear Contains statement gives shoppers a quick way to verify the major allergens used in the product.
Specific naming rules
Tree nuts, fish, and crustacean shellfish need specific names rather than broad categories. Labels should identify the nut type, fish species, or shellfish species, such as almonds, cod, or shrimp. That specificity matters because the FDA requires the food source to be clear enough for consumers to avoid the exact allergen.
Advisory statements
Advisory statements such as may contain [allergen] or produced in a facility that also uses [allergen] are voluntary. FDA guidance treats those warnings as cross-contact notices, not as required ingredient disclosures. A product can have a required disclosure, an advisory warning, both, or neither, depending on ingredients and manufacturing conditions.
When labels are unclear
If a package still does not make the allergen source clear, contact the manufacturer or distributor. FDA guidance specifically recommends that step when sesame is uncertain, and the same approach is useful for any major allergen when a recipe changes or an ingredient source is hard to verify.
How can PreciEat help with allergen checks?
PreciEat helps shoppers review ingredient lists faster by surfacing allergen-related terms and organizing label details in one place. The app does not replace the package label or a manufacturer answer, but it can reduce the time it takes to find the information that matters most during a grocery run.
- Scan labels fast: PreciEat helps shoppers review ingredient lists before purchase and spot allergen language sooner.
- Flag source names: The app can surface source names for milk, egg, fish, crustacean shellfish, tree nuts, peanuts, wheat, soybeans, and sesame.
- Compare products quickly: PreciEat helps shoppers move from one label to the next without losing track of the allergen source, the Contains statement, or advisory wording.
FAQ
What are the nine FDA major allergens?
The nine FDA major allergens are milk, egg, fish, crustacean shellfish, tree nuts, peanuts, wheat, soybeans, and sesame. FDA guidance treats sesame as the ninth major allergen, and packaged foods should name the source when any of these ingredients are used.
Where should I look first on a food label?
Start with the ingredient list and the Contains statement, if one is present. The FDA allows the allergen source to appear in parentheses after an ingredient or immediately next to the ingredient list in a Contains statement, which makes both spots useful for quick screening.
Do tree nuts, fish, and shellfish need specific names?
Yes. FDA guidance says labels must identify the specific tree nut, fish species, or crustacean shellfish species. A label should say almonds, cod, or shrimp instead of only tree nuts, fish, or shellfish, because the specific name is part of the required allergen source disclosure.
Are may contain warnings required by law?
No. FDA guidance treats may contain and similar facility statements as voluntary advisory statements. Those warnings are used to address possible cross-contact during manufacturing, but they are not the same as the required ingredient-based allergen disclosure that appears in the ingredient list or Contains statement.
What should I do if the label still does not make sense?
Contact the manufacturer or distributor. FDA guidance recommends that step when a shopper is still not sure whether a food contains sesame, and it is also useful for any major allergen when a recipe changes, a package is old stock, or the ingredient source is unclear.
Use PreciEat for a quicker label check
PreciEat can help you review allergen labels faster, but the package and the manufacturer remain the final sources of truth when anything is unclear. For shoppers who check labels often, that makes the process more organized without changing the FDA rules that govern allergen disclosure.