Undeclared Allergen Prevention: What Stops a Peanut Recall

A voluntary recall notice posted to FDA.gov on April 2, 2026 tells a familiar story. Karns Foods recalled its 8-ounce "Mini Dark Chocolate Raspberry Cups" because the packages may contain undeclared peanuts — an allergen that can cause serious or life-threatening reactions in sensitive individuals. The FDA recall notice is available at fda.gov.

The company did the right thing by issuing a voluntary recall. But the more useful question isn't what happened after the problem surfaced. It's what systems, controls, and verification steps would have caught this before a single package left the facility.

That's what this article is about.

Why Undeclared Allergens Keep Appearing on Recall Lists

Undeclared allergens are the single most common cause of FDA food recalls. According to FDA enforcement data, allergen-related recalls consistently account for roughly 40–50% of all Class I food recalls in any given year — the classification reserved for situations where there is a reasonable probability that consuming the product will cause serious adverse health consequences or death.

Peanuts are among the eight major food allergens defined by the Food Allergen Labeling and Consumer Protection Act of 2004 (FALCPA), codified at 21 U.S.C. § 343(w). That statute requires that peanuts be declared on the label whenever they are present as an ingredient or as a component of an ingredient — no exceptions for trace amounts, no de minimis threshold.

The Food Safety Modernization Act (FSMA), signed into law in 2011 and fully implemented through 21 CFR Part 117, added a second layer: manufacturers are required to treat allergen cross-contact as a hazard that must be evaluated in their Hazard Analysis and Risk-Based Preventive Controls (HARPC) plan. If your facility handles peanuts anywhere — in any line, any shared equipment, any co-manufactured product — that cross-contact risk must be formally analyzed, controlled, and verified.

The Karns Foods recall is a signal that somewhere in that chain, a gap existed. The question for every food manufacturer reading this is: does the same gap exist in your facility?

The Three Places Undeclared Allergens Enter a Product

In my experience working through allergen-related compliance issues with food manufacturers, undeclared peanuts or other allergens typically enter a finished product through one of three pathways. Understanding the pathway helps you understand where to focus your controls.

1. Ingredient Substitution Without Label Review

A supplier changes a sub-ingredient — swapping one chocolate compound for another, for example — without flagging the change to the receiving manufacturer. The new compound contains peanut-derived material or was processed on shared equipment. The label on the finished product still reflects the original formulation.

This is a supply chain control failure. It happens when ingredient change notification protocols aren't contractually required of suppliers, or when they are required but not enforced.

2. Cross-Contact Through Shared Equipment or Lines

The facility runs a peanut-containing product on the same line, in the same enrober, or through the same depositor as the product in question. The allergen cleaning validation — if one exists — wasn't sufficient to remove peanut residue before the next run.

Chocolate manufacturing environments are particularly vulnerable here. Tempering tanks, enrobers, and molds retain fats, and peanut proteins can bind to fat residue in ways that standard rinse-and-wipe cleaning doesn't fully address.

3. Label Error on a Correctly Formulated Product

The product itself is free of peanuts, but the wrong label is applied — either because of a labeling error in the packaging line setup, a misprint, or a label change that wasn't rolled out consistently across all SKUs or locations.

This is a labeling control failure, and it's more common than manufacturers want to admit.

What a Working Allergen Control Program Actually Looks Like

Under 21 CFR Part 117 Subpart C, manufacturers subject to FSMA must implement preventive controls for any hazard requiring one — and allergen cross-contact is explicitly listed as a type of hazard that typically requires a preventive control (§ 117.135(c)(2)). Here's what those controls need to actually do.

Allergen Hazard Analysis (§ 117.130)

The HARPC process starts with a written hazard analysis. For allergen hazards, that analysis must evaluate:

• Every ingredient and sub-ingredient in the formulation for each of the nine major allergens (peanuts, tree nuts, milk, eggs, fish, shellfish, wheat, soybeans, and sesame — sesame was added by FASTER Act effective January 1, 2023)
• Every allergen present anywhere in the facility, even in products on separate lines
• Every shared piece of equipment, utensil, or surface

The hazard analysis isn't a form you fill out once. It's a living document that gets updated when formulations change, when new ingredients are introduced, or when a supplier changes their own sourcing.

Allergen Preventive Controls

Once you've identified the hazards, 21 CFR § 117.135 requires that you put controls in place that provide assurance that the hazards will be significantly minimized or prevented. For allergen cross-contact, the applicable controls are:

Sanitation controls (§ 117.135(c)(3)): Written cleaning and sanitation procedures that have been validated to reduce allergen residue to levels that will not cause allergic reactions. "Validated" is the key word — a visual inspection after cleaning is not validation. You need swab testing data, ELISA testing, or equivalent analytical verification demonstrating that residue is below the action threshold.

Process order controls: If you can't validate that cleaning eliminates cross-contact risk between runs, schedule allergen-containing products at the end of the production run, so you're cleaning once rather than mid-shift.

Supplier approval and verification (§ 117.136 and § 117.180): You must approve suppliers whose ingredients could affect food safety, and you must conduct verification activities. For allergen-relevant ingredients, that means requesting and reviewing your suppliers' allergen control programs, their ingredient specifications, and — critically — their ingredient change notification procedures.

Allergen Verification Activities

Controls that aren't verified are just paperwork. FDA expects manufacturers to document that preventive controls are consistently applied and effective. For allergen controls specifically, that means:

• Environmental monitoring for allergens: Swab programs targeting post-cleaning residue on food contact surfaces, with documented results and corrective action triggers
• Finished product testing: Targeted testing of finished product for undeclared allergens, particularly for products manufactured after a line changeover from an allergen-containing run
• Label verification at line setup: A documented check — with a second set of eyes — confirming that the correct label is staged for each production run before packaging begins

According to a 2022 analysis by the Food Allergy Research & Education (FARE) organization, approximately 200,000 emergency room visits in the United States each year are attributable to allergic reactions to food, and a significant portion of those involve reactions to hidden or undeclared allergens. The stakes are not hypothetical.

Label Control: The Step That Gets Skipped

I want to spend a moment on label verification because it's the control step I see skipped most often — and it's cheap to fix relative to the cost of a recall.

A label verification program for allergen compliance needs three things:

1. A master label register that maps each SKU to its approved label version, with effective dates and revision history. When a formulation changes, the register is the record that shows which labels are current and which are obsolete.

2. A line setup verification procedure that requires a documented check — signed and dated — confirming the correct label is loaded before the run begins. This should be a mandatory hold point, not an informal walkthrough.

3. A finished goods label audit that pulls samples from each run and verifies label accuracy against the master register before the product is released to distribution.

None of this is operationally complex. It requires discipline and documentation, not capital investment. And it would catch the label-application class of allergen incidents before product ships.

The FASTER Act and Sesame: A Compliance Deadline Many Manufacturers Missed

One development worth naming explicitly for manufacturers who are updating their allergen programs right now: the FASTER Act of 2021 (Pub. L. 117-11) added sesame as the ninth major food allergen under FALCPA. The mandatory labeling requirement for sesame took effect January 1, 2023.

This matters for two reasons. First, any manufacturer who hasn't updated their allergen hazard analysis to include sesame since January 2023 is operating with an incomplete HARPC plan — which is itself a regulatory violation under 21 CFR § 117.130. Second, the sesame addition created a documented pattern of labeling errors in the industry as manufacturers added sesame disclosures and inadvertently introduced other allergen omissions or errors in the process. If your label went through a revision in 2022 or 2023, that's a natural point to audit your current label against your current formulation.

FDA has indicated through guidance and warning letters that allergen labeling compliance remains an active enforcement priority through 2025 and into 2026. This is not a compliance area where enforcement is easing.

How a Gap Analysis Finds These Issues Before FDA Does

A formal allergen control gap analysis — run against 21 CFR Part 117 Subpart C and FDA's guidance document "Allergens and Food Labeling" — will surface most of the control failures that lead to recalls like this one. In my work with food manufacturers, I typically structure that analysis around four questions:

1. Is your allergen hazard analysis current, and does it reflect every ingredient and sub-ingredient in your current formulations?
2. Do your supplier agreements include allergen change notification requirements, and are you verifying compliance?
3. Have your allergen cleaning procedures been validated with analytical data — not just visual inspection?
4. Does your label verification program include a mandatory hold point before each production run?

If you can answer yes to all four with documented evidence, you're in reasonable shape. If any of these produce a hesitation, that's where the work is.

At Certify Consulting, we've helped more than 200 food and regulated-product manufacturers build and verify allergen control programs that hold up under FDA inspection. The goal isn't to pass an audit — it's to build the kind of system that makes a recall genuinely unlikely.

Practical Steps to Take Now

If this recall prompted you to think about your own allergen program, here's a reasonable sequence for the next 30 days:

This isn't an exhaustive list, but it covers the most common failure points. If your program is already strong in these areas, document that fact — because FDA will ask for records, not assurances.

A Note on Voluntary Recalls

It's worth acknowledging that issuing a voluntary recall, as Karns Foods did, is the responsible choice when a problem is identified. FDA strongly prefers voluntary action, and manufacturers who self-identify and self-report allergen issues are generally treated more favorably in subsequent regulatory interactions than those who don't.

But the preference should be that you find the problem before the product is distributed — not after. The systems described in this article exist to make that possible.

If you have concerns about your allergen control program and aren't sure where to start, reach out to Certify Consulting for a compliance assessment. We've guided clients through allergen control gaps, FSMA HARPC development, and FDA inspection preparation — and we've maintained a 100% first-time audit pass rate across more than 200 client engagements.

The goal is straightforward: build systems strong enough that a recall never becomes necessary.

For additional guidance on building food safety management systems that integrate allergen controls with broader quality frameworks, see our resources on FSMA compliance and food safety program development.

Last updated: 2026-04-25