The Single Most Common Reason Products Get Recalled
If you look at U.S. food recall data year over year, one cause consistently tops the list: undeclared allergens. More than pathogens, more than foreign material, more than spoilage. And the majority of those recalls are traceable to co-packing facilities where allergen controls broke down — often in ways no one noticed at the time.
If you're producing in a shared co-packing facility, allergen control isn't optional. It's the specific discipline that keeps your brand out of recall news.
What Counts as a Major Allergen
U.S. federal law (FALCPA, plus the 2021 FASTER Act) recognizes nine major allergens: milk, eggs, fish, crustacean shellfish, tree nuts, peanuts, wheat, soy, and sesame. Each of these has specific labeling requirements and specific consequences for cross-contact — the unintentional transfer of allergen from one product to another.
Every major allergen in your product has to be clearly declared on the label, in the manner required by the regulation. And if another product run on the same line contains an allergen your product doesn't, cross-contact risk has to be actively managed — not assumed away.
What "Cross-Contact" Actually Means in a Co-Packing Facility
Cross-contact happens when residue from one product ends up in another via shared equipment, shared air, shared personnel, or shared storage. In a co-packing context, typical vectors include:
Kettles and cook vessels. Residue in valves, gaskets, dip tubes, and seals doesn't always clean out with standard sanitation.
Fillers and closures. Fill pistons, hoses, and capping heads can hold residue, especially with viscous products.
Conveyors and contact surfaces. Belts, transfer points, and anything your product physically touches.
Airborne transfer. Powdered ingredients (flour, powdered milk, peanut flour) can aerosolize and settle on adjacent lines — one of the most under-controlled vectors.
Personnel. Gloves, aprons, sleeves, and utensils moving between lines without proper hygiene reset.
Shared storage and weigh-up stations. Ingredients staged next to allergenic ingredients can pick up residue from shared scoops, scales, or containers.
What a Real Allergen Control Program Looks Like
Scheduling and sequencing
Products are run in a specific order: non-allergen products first, allergen-containing products later in the shift, with a full sanitation cycle between. This is the single most effective allergen control tool in a shared facility.
Validated sanitation procedures
The cleaning protocol between an allergen-containing run and the next product has to be documented, validated (with swab testing or ATP verification), and executed the same way every time. "We cleaned it really well" is not validation.
Dedicated equipment or color-coded tools
Small contact items (scoops, gaskets, seal components) that are hard to fully clean are often dedicated to specific allergen status or color-coded to prevent mix-ups.
Ingredient segregation
Allergenic ingredients are stored separately, handled with dedicated tools, and weighed in areas that don't share air or surfaces with non-allergenic ingredients.
Labeling verification
Every finished package is verified to match the actual product run, with label reconciliation at the start and end of each run to catch mix-ups. This is where "undeclared allergen" recalls often originate — not the production itself, but a labeling swap.
"May contain" precautionary labeling
If cross-contact can't be reliably prevented, many products carry precautionary statements like "manufactured in a facility that also processes peanuts." These statements have legal complexity — they're not a free pass, and overuse has become a scrutinized practice. A qualified labeling advisor should guide specific language.
The Specific Questions to Ask a Co-Packer
Before committing to a co-packer, get specific answers to:
Which of the nine major allergens are present in the facility? (Not just on the line running your product — in the facility at all.)
What's the scheduling policy around allergen runs?
How is sanitation between allergen-containing and allergen-free runs validated? (Ask for documentation.)
Is airborne transfer controlled for dry/powdered allergens?
What allergen training does production staff receive, and how often?
What's the history of allergen-related holds, rejects, or recalls in the last 3 years?
If a co-packer can't answer these clearly, that's information in itself. For context on the broader co-packer relationship, see working with co-packers.
Free-From Claims Are a Higher Bar
If your product carries a claim like "gluten-free," "dairy-free," "peanut-free," or similar free-from language, the allergen control requirements step up significantly. Certified claims (e.g., Certified Gluten-Free at under 10 ppm) require specific testing protocols, facility controls, and in many cases third-party audits. Uncertified free-from claims still create legal exposure if the product can't actually be produced to that standard.
Don't make free-from claims casually. A claim that fails an audit or a consumer test is a public relations event at best and a recall at worst.
Common Pitfalls
Assuming "we don't use that allergen" is enough. If the facility uses it, your product can be exposed. Ingredient-level absence doesn't equal facility-level absence.
Relying on verbal assurances. Sanitation protocols, training records, and allergen status documentation should be written and shared on request.
Skipping your own labeling verification. Even with a responsible co-packer, periodic spot-checks on finished product labels vs. formulation are worth doing.
Overusing "may contain" language. If you rely on precautionary labeling to cover preventable cross-contact, you've shifted liability to the consumer and created brand risk.
Not maintaining your own records. If something goes wrong, you'll need to trace lots, ingredient suppliers, and production dates. A co-packer's records are useful but not a substitute for your own.
Frequently Asked Questions
Do I need my own allergen program if I don't manufacture in-house?
Yes. You're the brand owner on the label. Legal and regulatory accountability for allergen declaration lives with you, even if production happens at a third party. Your program ensures your co-packer's program is being followed for your product.
What's the difference between a "may contain" statement and an allergen declaration?
An allergen declaration identifies ingredients actually in your product that trigger labeling requirements. A "may contain" statement is precautionary — it warns of possible cross-contact when the allergen isn't an ingredient but can't be reliably excluded. The legal standards and consumer interpretations differ.
If I reformulate to remove an allergen, is the facility issue solved?
Your product's ingredient label changes, but if the facility still handles that allergen on shared equipment, your product still has cross-contact risk. Removing an allergen from the recipe and removing exposure from the product are different things.
How often should allergen swab testing happen?
This is facility- and product-dependent. Routine testing tied to sanitation validation is common; additional testing in response to specific risks or claims is standard practice. Your co-packer's program should define the frequency.
A Final Note
Allergen control is the kind of discipline that's invisible when it works and catastrophic when it doesn't. A specialist in food safety and a qualified regulatory advisor should guide your specific program — this article is a framework, not a certification. If you're evaluating a co-packer or a free-from claim strategy and you want help thinking it through, a discovery call is a reasonable place to start.
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