Allergen Labeling Controls That Prevent FDA Recalls

Last updated: 2026-04-17

In April 2026, Karns Foods voluntarily recalled its Mini Dark Chocolate Raspberry Cups after it was discovered the product may contain undeclared peanuts — a major allergen that, for sensitive individuals, can trigger a life-threatening anaphylactic reaction. The FDA recall notice is a few sentences long, but what sits behind it is probably months of quality system gaps that nobody caught in time.

I've worked with food manufacturers long enough to know that undeclared allergen recalls rarely happen because a company didn't care. They happen because allergen control was treated as a labeling problem rather than a manufacturing problem. That's the distinction I want to walk through here, because it's the one that tends to matter most when the FDA comes looking.

Why Undeclared Allergen Recalls Keep Happening

The FDA receives hundreds of recall notifications each year, and undeclared allergens consistently rank among the most common causes. According to FDA recall data, allergen-related recalls account for roughly 40% of all food recalls in any given year. The top offenders — peanuts, tree nuts, milk, wheat, and soy — appear in products where cross-contact occurred at some point in the supply chain, the formulation, or the labeling process.

What's striking is that the Food Allergen Labeling and Consumer Protection Act (FALCPA) has been in force since 2004. The Food Safety Modernization Act (FSMA) added further teeth through 21 CFR Part 117, which requires Hazard Analysis and Risk-Based Preventive Controls (HARPC) — specifically naming allergen cross-contact as a hazard that must be analyzed and controlled. FASTER Act of 2021 added sesame as a ninth major allergen effective January 1, 2023. These aren't new rules. The framework has been in place for years.

And yet the recalls keep coming.

In my view, the gap isn't regulatory knowledge — most food manufacturers know peanuts are a major allergen. The gap is in the quality systems that translate that knowledge into reliable daily practice on the production floor.

What the Regulations Actually Require

Under 21 CFR Part 117.135, manufacturers must implement preventive controls for any hazard that requires one — and allergen cross-contact is explicitly named as a food safety hazard in 21 CFR Part 117.130(a)(2)(ii). That means your Food Safety Plan must include:

• Allergen controls as a category of preventive control (21 CFR Part 117.135(c)(2))
• Monitoring procedures that verify those controls are actually working
• Corrective action procedures when monitoring reveals a control isn't functioning
• Verification activities, including validation that your controls are effective before product ships

The labeling side is governed separately by FALCPA (21 U.S.C. § 343(w)), which requires that each of the nine major allergens be declared either in the ingredient list using common names or in a "Contains" statement. Failure to declare a major allergen is a misbranding violation under 21 U.S.C. § 343, which is exactly what triggers a recall.

What the regulation doesn't spell out clearly enough — and where many manufacturers get into trouble — is that a labeling review alone won't catch cross-contact allergens that enter your product through shared equipment, shared facilities, or ingredient substitutions. You need the whole system working together.

The Three Places Allergen Failures Actually Happen

When I do a gap assessment for a food manufacturer, I look at three zones where undeclared allergen events tend to originate. Most recalls can be traced back to at least one of them.

1. Ingredient and Supplier Controls

The most underappreciated source of undeclared allergen events is the ingredient itself — specifically, when a supplier reformulates or substitutes a component without adequate notification to the manufacturer.

A chocolate coating that formerly contained no peanut-derived ingredients can change. A "natural flavor" blend can be reformulated. A carrier agent can shift. If your supplier qualification program doesn't include requirements for ingredient change notifications and updated allergen declarations, you may not know until a consumer calls or a third-party test flags the issue.

Under 21 CFR Part 117.136, your supplier program must include procedures for verifying that your suppliers are controlling hazards — and allergen hazards have to be part of that picture. A certificate of analysis alone is not sufficient verification for allergen status. You need allergen-specific attestations, ideally with supporting testing data, particularly for ingredients that are processed in facilities that handle major allergens.

2. Manufacturing and Shared Equipment Controls

Shared production lines and shared equipment are where cross-contact most commonly happens in practice. A chocolate product made after a peanut-containing product on the same line, without a validated allergen cleaning procedure in between, is a cross-contact event waiting to happen.

What most facilities have is a cleaning procedure. What fewer have is a validated cleaning procedure — one where the cleaning method was tested against actual residue levels and documented as effective at removing allergen to an acceptable threshold. That's a meaningful difference, and the FDA inspectors who are trained in FSMA enforcement know to look for it.

The practical controls here include:

• Scheduling allergen-containing products at the end of production runs where feasible, so cleaning can be more intensive before a changeover
• Validated cleaning and sanitation procedures specific to allergen removal (not just general sanitation)
• Dedicated equipment for high-risk allergens like peanuts and tree nuts when shared equipment cleaning cannot be validated to acceptable levels
• Environmental monitoring for allergen residue at changeover verification points

3. Label Review and Reconciliation Controls

The labeling failure is where the recall becomes official, but in many cases the labeling failure is downstream of a manufacturing or formulation failure. By the time the wrong allergen shows up on a consumer's plate, the label was the last line of defense that didn't hold.

Label controls that actually work include a reconciliation process where every production run's ingredients are compared against the approved label before product is released. This sounds obvious, but in practice it often isn't happening on a batch-by-batch basis — it gets done at the formulation approval stage and then assumed to be stable.

Formulation changes, ingredient substitutions, and supplier changes all need to trigger a label review as part of a formal change control procedure. That's the procedural firewall that catches the problem before product ships.

What an Effective Allergen Control Program Looks Like

Here's a comparison of what I see in facilities that consistently pass allergen-related FDA inspections versus facilities that get caught in recalls or 483 observations:

The difference between these two columns is not budget. It's whether allergen control is treated as a quality system function with ownership, documentation, and verification — or as a labeling task handled during product development and then forgotten.

Testing Protocols Worth Having

Allergen testing is not a substitute for good process controls, but it is a meaningful verification layer. A risk-based allergen testing program should include at minimum:

Environmental monitoring at changeover. Before a non-allergen product runs on a line previously used for a peanut-containing product, swabbing critical contact surfaces and testing with a validated ELISA method gives you documented evidence that your cleaning procedure actually worked. The Neogen Veratox and ELISA Systems test kits are widely used for this purpose, with detection thresholds in the range of 2.5–10 ppm for peanut protein.

Finished product testing on a risk-based schedule. Not every lot needs to be tested, but new suppliers, new formulations, changeover validation runs, and any product where allergen risk was assessed as elevated should have finished product testing as part of the verification record.

Inclusion/exclusion allergen matrices. For facilities producing multiple SKUs with different allergen profiles, a documented allergen matrix that maps which allergens are present in each product and each production zone helps scheduling decisions and helps operators know what they're working with on any given day.

A 2022 study published in the Journal of Food Protection found that among food facilities that experienced allergen-related recalls, fewer than 30% had conducted any finished product allergen testing prior to the recall event. That's a striking number, and in my view it reflects how many manufacturers still treat allergen control as a documentation exercise rather than a verification one.

The FSMA Enforcement Trend You Should Know About

FDA has been sharpening its allergen enforcement posture since the rollout of FSMA's preventive controls rules, and that trend has continued into 2026. Allergen-related 483 observations and warning letters increasingly cite not just the absence of allergen controls, but the absence of validation and verification for those controls. It's no longer sufficient to have a cleaning procedure on paper — inspectors want to see the validation data that proves the procedure works.

Under 21 CFR Part 117.160, verification activities must include validation of the process preventive controls before the facility's food safety plan is implemented, and whenever there's a signal that a control may not be performing as intended. An undeclared allergen consumer complaint is exactly that kind of signal — and a recall is what happens when you didn't catch the signal earlier in the process.

The practical implication is that facilities need documented validation studies for their allergen cleaning procedures, not just SOPs. If you don't have those, that's a gap worth closing before an investigator finds it.

Where to Start If You're Not Sure Where You Stand

If you're reading this because a recall like this one made you wonder about your own allergen controls, that instinct is worth following. Here's a practical starting point:

First, pull your current Food Safety Plan and look at how allergen cross-contact is documented as a hazard. Is it addressed? Is there a specific preventive control assigned to it, with monitoring, corrective action, and verification procedures? If it's listed as a hazard with no corresponding preventive control because you judged it "unlikely," document the basis for that decision carefully — and make sure it reflects your actual production conditions today, not when the plan was written.

Second, look at your supplier agreements and ask whether they require allergen change notifications. If a supplier reformulated an ingredient tomorrow, would you know before it showed up in your product?

Third, look at your label change control procedure and trace the last three ingredient or supplier changes you made. Did each one trigger a formal label review? If the answer is "I think so" or "probably," that's the gap to close.

A gap assessment doesn't have to be a full audit. Sometimes it's just asking those three questions honestly and seeing where the answers get uncomfortable.

What Would Have Prevented This

I can't know with certainty what specific system failure led to peanuts appearing in Karns Foods' Mini Dark Chocolate Raspberry Cups — the recall notice doesn't say, and root cause is almost never that simple. But the category of failure is familiar: an allergen entered the product through a pathway that wasn't being monitored, and it wasn't caught before product reached consumers.

The controls that tend to prevent events like this are not exotic. They're the ones described above — supplier change notification requirements, batch-level ingredient reconciliation, validated cleaning procedures, and a label change control process that fires every time something in the formulation or supply chain shifts. Most of these are already required by 21 CFR Part 117. The question is whether they're actually implemented, documented, and verified on a routine basis, or whether they exist as paper commitments that haven't been stress-tested.

In my experience working with food manufacturers across more than 200 engagements, the companies that avoid recalls are not necessarily the ones with the most sophisticated programs. They're the ones where allergen control has clear ownership, where the verification records are current, and where people on the production floor know what the allergens are and what to do when something changes. That's achievable for almost any food manufacturer. It just requires treating allergen control as a live system rather than a static document.

If you're not sure where your program stands, a GMP gap assessment is a practical way to find out before an FDA investigator does it for you. And if you're building or rebuilding your allergen control program from scratch, our food safety consulting services are designed to get you to a defensible, inspection-ready state efficiently.

The Karns Foods recall is a reminder that undeclared allergen events are still happening in 2026, more than twenty years after FALCPA put allergen labeling requirements into law. The regulatory framework is not the problem. The implementation is. And that's something manufacturers can actually fix.

Last updated: 2026-04-17