The United States requires food labels to declare nine major allergens, milk, eggs, fish, crustacean shellfish, tree nuts, peanuts, wheat, soybeans, and sesame, using plain language in the ingredient list or in a separate “Contains” statement. If you’re a shopper, read both spots before you buy. If you make or pack food, your single best move right now is verifying every supplier spec sheet and updating labels the moment a formulation changes.
TL;DR:
- Shoppers should check both the ingredient list and the Contains line; voluntary may contain warnings do not confirm whether cross contact occurred.
- Precautionary warnings are voluntary and inconsistently used, so people with severe allergies often avoid products carrying a warning for their allergen.
- Manufacturers should obtain updated supplier specifications, review labels after every formulation change, and trace allergens through compound ingredients before production.
- A U.S. label may not satisfy Canadian or European Union rules: Canada flags mustard, while the EU requires declarations for 14 allergens, including celery and lupin.
Table of Contents
- Which allergens must be labeled: the Big 9 and international differences
- U.S. regulatory requirements: FALCPA, FDA enforcement, and the exceptions nobody mentions
- How to read a food label for allergens: a step-by-step method
- Precautionary labeling and “may contain” statements: what they mean and their limits
- Common labeling mistakes and a manufacturer checklist to avoid recalls
- How co-packers apply allergen rules on real production lines
- Penalties and enforcement for allergen labeling violations
- Labeling for allergen-free products and related claims
- Updates and trends in allergen labeling regulations
- Why accurate allergen labeling matters more than it gets credit for
- How we handle labeling for private label and co-packing clients
- FAQ
- Sources
Which allergens must be labeled: the Big 9 and international differences
In the United States, food labels must name nine allergens whenever they’re used as ingredients. These are:
- Milk
- Eggs
- Fish (such as bass, flounder, or cod)
- Crustacean shellfish (such as crab, lobster, or shrimp)
- Tree nuts (such as almonds, walnuts, or pecans)
- Peanuts
- Wheat
- Soybeans
- Sesame
Sesame joined this list as the ninth major allergen, and manufacturers declare each one by its common or usual name rather than a scientific or trade term. “Casein” has to show up with a plain-language note that it comes from milk, for instance, because a label that only says “casein” doesn’t tell most readers anything useful.
Here’s where it gets more interesting if you sell or buy across borders: there’s no single global list. Canada’s priority allergen list is similar to the U.S. version but explicitly includes mustard as a priority allergen, and Canadian labeling rules require prescribed source names that don’t always match U.S. wording. The European Union’s list runs to 14 allergens, adding items like celery, lupin, and molluscs that American labels don’t flag at all. If you’re building a product for multiple markets, assuming one label design works everywhere is a fast way to end up noncompliant somewhere.
Gluten and sulphites often get mentioned in the same breath as allergens, but they’re handled separately. Gluten relates to grains like wheat, barley, and rye and matters most for people with celiac disease, while sulphites are declared when present at or above Canadian rules. Neither is technically part of the U.S. “Big 9,” but both show up on ingredient lists often enough that it’s worth knowing the difference.
U.S. regulatory requirements: FALCPA, FDA enforcement, and the exceptions nobody mentions
The Food Allergen Labeling and Consumer Protection Act, known as FALCPA, is the law behind the declaration requirement. It mandates that packaged food sold in the United States name the food source of any major allergen used in the product, and manufacturers typically satisfy this by listing the allergen’s common name directly in the ingredient list or by adding a “Contains” statement right after it. For a practical breakdown of how this plays out on real labels, our post on declaring the Big 9 allergens walks through both accepted formats.
The FDA oversees most packaged foods, but its authority has real edges:
- Meat, poultry, and certain egg products fall under USDA jurisdiction instead of FDA, with their own labeling review process.
- Alcoholic beverages are regulated by the Alcohol and Tobacco Tax and Trade Bureau (TTB), which has separate allergen disclosure practices.
- Some fresh, unprocessed agricultural products are exempt from standard packaged-food labeling rules entirely.
When a product’s regulation overlaps these categories, like a wine-based sauce or a poultry product with a soy-based marinade, it’s worth checking which agency’s rules actually apply before finalizing label copy, since assuming FDA rules cover everything can leave a real gap.
The consequence for skipping a declaration is serious. A food missing a required allergen declaration is considered misbranded under FALCPA, which gives the FDA grounds for enforcement action regardless of whether anyone has been harmed yet. In practice, that means the product can trigger inspection findings, a recall, or both, and recalls tied to undeclared allergens remain one of the most common categories reported to the agency year after year.
How to read a food label for allergens: a step-by-step method
Reading a label for allergy safety takes less than thirty seconds once you know where to look. Here’s the sequence worth using every time:
- Scan the ingredient list first. Allergens are supposed to appear in plain language, either as the ingredient itself (“milk,” “wheat flour”) or as a parenthetical note after a technical term, like “lecithin (soy).”
- Check for a “Contains” statement. Manufacturers often group every major allergen into one line right after the ingredient list, something like “Contains: Milk, Wheat, Soy.” This is a legally valid way to declare allergens once instead of scattering parenthetical notes throughout a long ingredient list.
- Read precautionary and marketing claims separately. A “may contain tree nuts” statement is voluntary and not the same as a declared ingredient, and a “gluten-free” or “allergen-free” claim on the front of the package doesn’t replace checking the ingredient list, since those claims follow their own separate rules.
Pro Tip: Keep a mental “two-stop” rule: ingredient list first, “Contains” statement second. If your allergen isn’t in either spot, the manufacturer isn’t required to tell you it’s absent.
A quick example makes this concrete. A granola bar might list “peanut butter, oats, chocolate chips (milk, soy lecithin)” in its ingredients, then follow with “Contains: Peanuts, Milk, Soy, Wheat.” That’s two allergens declared directly in the list (peanuts, implied by peanut butter) and reinforced in the statement, plus milk and soy called out parenthetically and again in the summary line. Your three-point checklist as a shopper: read the ingredient list, confirm the “Contains” line matches what you expect, and treat any “may contain” wording as a yellow flag rather than a hard rule either way.
Precautionary labeling and “may contain” statements: what they mean and their limits
Precautionary allergen labeling, usually written as “may contain” or “processed in a facility that also handles,” is voluntary. No U.S. or Canadian regulation currently requires it, and it exists to flag cross-contact risk from shared equipment or facilities rather than an intentional ingredient.
The problem is that this voluntary status has led to wildly inconsistent use. Peer-reviewed analysis on allergen labeling notes that precautionary statements are largely unregulated across many markets, which creates real confusion: some manufacturers slap “may contain” on everything as a liability shield, while others reserve it for genuine, assessed cross-contact risk. That inconsistency means two products with identical warnings can carry very different actual risk levels, and allergic consumers have no reliable way to tell which is which from the label alone.
Health Canada has pushed back on this overuse directly, recommending that precautionary statements follow a documented risk assessment rather than blanket caution, and advocating a single preferred phrase, “may contain [allergen],” instead of the dozen variations currently in circulation.
Precautionary statements should be based on a risk assessment and not used as a substitute for adherence to good manufacturing practices.
That line sums up the core issue: “may contain” is meant to communicate assessed risk, not to cover for sloppy sanitation.
What this means practically:
- Consumers with severe or life-threatening allergies often choose to avoid products carrying any precautionary statement for their allergen, since there’s no reliable way to judge the actual risk behind the wording.
- Manufacturers should reserve precautionary labeling for genuine, assessed cross-contact scenarios, not as a blanket liability hedge, and should lean on proper cleaning and scheduling controls first.
Common labeling mistakes and a manufacturer checklist to avoid recalls
Most allergen-labeling failures trace back to a handful of avoidable gaps rather than deliberate rule-breaking. A supplier changes a spice blend’s formulation without notifying the buyer, or a label gets reprinted with last year’s ingredient list, and suddenly a product is misbranded without anyone intending it to be.
Here’s a working checklist that holds up across co-packing and private-label projects:
- Require current spec sheets from every supplier, not just at onboarding but on an ongoing basis, and confirm each sheet explicitly lists allergen content for every component.
- Trigger a label review on any supplier formulation change, no exceptions, since even a minor ingredient swap in a sub-component can introduce an undeclared allergen.
- Declare allergens at every ingredient generation. A spice blend used inside a sauce used inside a finished dish still needs its allergens traced and declared, even though it’s three steps removed from the final product; the Canadian guidance on ingredient lists covers this generational tracing clearly.
- Build in time for artwork and regulatory review before shipping. Rushing a label change to meet a shipping date is how outdated allergen statements slip through.
Pro Tip: Keep every supplier attestation on file for at least as long as the product’s shelf life plus one year. If an inspector or a recall investigation comes knocking, that paper trail is what proves you did your diligence.
For a more detailed operational breakdown, our 60 to 90 day checklist for updating FDA allergen labels covers the full change-control timeline manufacturers and co-packers typically need to follow.
How co-packers apply allergen rules on real production lines
Chadi has written at length about allergen labeling for businesses navigating private label and co-packing work, including a breakdown of allergen labeling requirements that covers common compliance gaps we see from new brands.
In practice, a co-packer’s job on allergen compliance looks like this:
- Pull and review supplier documentation before a new ingredient ever touches the production line, not after.
- Flag any shared equipment or facility risk and decide, case by case, whether a precautionary statement is warranted or whether better scheduling and cleaning eliminates the need for one.
- Keep label artwork in sync with the current formulation at all times, since a private-label client changing their recipe doesn’t automatically update the label unless someone catches it.
None of this requires exotic tools, just consistent habits applied the same way on every batch.
Penalties and enforcement for allergen labeling violations
Undeclared allergens are treated as a misbranding violation, and the FDA can pursue several enforcement paths depending on severity. A warning letter is often the first step for a minor or first-time labeling gap, giving a company a window to correct the issue before further action.
For more serious or repeated violations, the agency can request a voluntary recall or, if a company refuses, pursue a mandatory recall order. Products can also be detained at import, and in cases involving repeated noncompliance or apparent disregard for safety, the FDA can pursue seizure of goods or injunctions against further distribution. Undeclared major allergens are consistently among the most common reasons packaged foods get recalled in the United States, which tells you how often this specific mistake happens even among established manufacturers.
Beyond regulatory action, there’s reputational fallout that often outlasts the recall itself. A recall tied to an undeclared allergen tends to get wide press coverage because the health stakes are immediate and visible, and retailers can be slow to restock a brand after an incident like that. For a small manufacturer or a new private-label brand, one allergen recall can do more lasting damage to retailer relationships than the direct cost of the recall itself.
Labeling for allergen-free products and related claims
Claims like “peanut-free,” “dairy-free,” or “allergen-free” sit outside the mandatory declaration system, and that distinction matters more than most shoppers realize. There’s no single federal standard defining exactly what “allergen-free” must mean on a package, which means the claim rests on the manufacturer’s own testing and controls rather than a uniform government threshold.
“Gluten-free” is the one major exception with a defined federal standard: it requires the product to contain fewer than 20 parts per million of gluten, which is a specific, enforceable threshold rather than a marketing phrase. Other free-from claims don’t carry an equivalent legal definition, so two “dairy-free” products from different manufacturers could follow very different internal verification standards.
For a manufacturer or co-packer, making a free-from claim responsibly means backing it with real testing and dedicated-line or thoroughly cleaned shared-line production, not just the absence of the allergen from the ingredient list. A product can technically have no allergen listed as an ingredient and still carry cross-contact risk from shared equipment, which is exactly the gap precautionary labeling exists to flag. Claiming “allergen-free” without addressing that cross-contact risk is one of the more common ways well-meaning brands end up overstating what their label can actually promise.
Updates and trends in allergen labeling regulations
Sesame’s addition to the U.S. major allergen list was one of the most significant recent changes to federal allergen labeling, and it’s a useful signal of where the broader regulatory trend is headed: toward expanding, not shrinking, the list of ingredients that require mandatory declaration.
Precautionary labeling reform is the next major area regulators are circling. Health Canada’s push toward a single, risk-assessment-based “may contain” phrasing reflects a broader international conversation about tightening what’s currently an unregulated, inconsistent practice. Industry guidance for food processors increasingly frames precautionary statements as a tool that has to follow a documented risk assessment rather than a substitute for good manufacturing practices, and that framing is likely to keep gaining traction as more markets formalize PAL rules.
Cross-border harmonization remains the unresolved piece. The U.S., Canada, and the EU still maintain different allergen lists and different rules for prescribed source names, and there’s no indication that’s converging into a single global standard any time soon. For manufacturers selling into multiple markets, that means label review needs to happen separately for each target country rather than assuming one compliant label clears every border.
Why accurate allergen labeling matters more than it gets credit for
Allergen labeling isn’t a paperwork formality, it’s the single piece of information standing between a severe allergic reaction and a normal day for millions of people. Getting it right, consistently, on every batch and every label revision, is the most direct safety work a food business does. If you’re building or packing a product and want to see how this plays out operationally, our blog covers the practical side in more depth.
— Chadi
How we handle labeling for private label and co-packing clients
If you’re building a private-label candy or snack brand and allergen compliance feels like one more thing on an already long list, that’s exactly where our private label, co-packing, and packaging services come in. These services often include dry food co-packing, pouch packaging, commercial freeze drying, and confectionery and chocolate production with label accuracy built into the process rather than bolted on at the end.
We also distribute our own freeze dried candy and treats directly, so you can see finished, properly labeled packaging before committing to a production run of your own. If you’re ready to talk about a wholesale or private-label partnership, start with our wholesale application and we’ll walk you through next steps.
This article is general information, not a substitute for advice from a qualified lawyer. Consult a qualified legal professional about your own circumstances before acting on anything here.
FAQ
What are the 14 allergens that must be labeled?
The “14 allergens” list is a European Union standard, not a U.S. one; it includes items like celery, mustard, lupin, and molluscs alongside the more familiar milk, eggs, and peanuts. The United States requires only nine major allergens to be declared, so the applicable list depends entirely on which market the product is sold in.
What are the FDA requirements for food allergen labeling?
Under FALCPA, the FDA requires packaged foods to declare the food source of any of the nine major allergens used as an ingredient, named in plain language either within the ingredient list or in a separate “Contains” statement. Products missing this declaration are considered misbranded, which can lead to recalls or other enforcement action.
What are the 7 types of allergens?
There’s no standard “7 allergens” list in current food regulation; this number doesn’t match the U.S. Big 9, Canada’s priority allergens, or the EU’s list of 14 allergens. If you’ve seen this figure referenced, it’s likely an outdated or regional list that predates more recent regulatory updates like the addition of sesame.
What are the 9 main allergens?
The nine major U.S. allergens are milk, eggs, fish, crustacean shellfish, tree nuts, peanuts, wheat, soybeans, and sesame. Manufacturers must declare each one by its common name, either directly in the ingredient list or in a “Contains” statement right after it.
Is “may contain” labeling required by law?
No, precautionary statements like “may contain” are voluntary in the United States and Canada, and no current regulation mandates their use. Health Canada has recommended that when manufacturers do use them, they should follow a documented risk assessment rather than being applied as a blanket precaution.
Sources
- Food Allergy: Labelling and exposure risks — PMC
- The Use of Food Allergen Precautionary Statements on Prepackaged Foods — Health Canada
- Inspection
- Food labeling & allergens — Food Safety for Processors (NCSU)