Allergen Labelling for Pre-Packed Food: UK vs US vs EU

If you sell food online through Shopify, allergen labelling is one of the most consequential compliance decisions you will make. Get it right and you protect your customers, build trust, and avoid regulatory penalties. Get it wrong and the consequences range from enforcement notices to product recalls — and in the most serious cases, fatal allergic reactions. The stakes are not theoretical: in the UK alone, around 2 million people live with a diagnosed food allergy, and thousands more experience reactions each year from unlabelled or mislabelled products.

The challenge for food businesses selling internationally is that the rules differ significantly between the UK, the United States, and the European Union. These are not minor formatting differences — they reflect genuinely different regulatory philosophies, different lists of controlled allergens, and different enforcement mechanisms. A label that is fully compliant under UK law may be non-compliant under US FDA rules, and vice versa. For Shopify merchants shipping across borders, understanding these distinctions is not optional: it is the foundation of a legally defensible product listing.

In this post, you will learn how allergen labelling works under UK law post-Brexit, how US FDA requirements compare, and where the EU framework sits in relation to both. You will also get practical guidance on what this means for your Shopify product pages, ingredient declarations, and digital labelling workflow.

UK Allergen Labelling: What the Law Actually Requires

In the United Kingdom, allergen labelling for pre-packed food is governed by Retained Regulation (EU) No 1169/2011, incorporated into domestic law as the Food Information to Consumers (FIC) Regulations. Despite Brexit, the UK retained the EU FIC framework almost wholesale — which means the core obligations are broadly similar to EU rules, though the UK now has the power to diverge. The Food Standards Agency (FSA) is the primary enforcement body in England, Wales, and Scotland, with Food Standards Scotland having additional oversight north of the border.

Under UK law, there are 14 major allergens that must be declared whenever they are present as an ingredient or processing aid. These are: celery, cereals containing gluten (wheat, rye, barley, oats, spelt, kamut), crustaceans, eggs, fish, lupin, milk, molluscs, mustard, peanuts, sesame, soybeans, sulphur dioxide and sulphites (at concentrations above 10mg/kg or 10mg/litre), and tree nuts (almond, hazelnut, walnut, cashew, pecan, Brazil, pistachio, macadamia). When any of these appear in a pre-packed product, they must be emphasised in the ingredients list — typically using bold text — so they are visually distinct from surrounding ingredients.

The UK also has specific rules for pre-packed for direct sale (PPDS) food, updated through Natasha's Law, which came into force on 1 October 2021. PPDS foods — items packaged at the same premises where they are sold, before a customer orders them — must now carry a full ingredient list with allergens emphasised. For Shopify merchants producing baked goods, sandwiches, or meal kits, this rule is directly applicable. Failure to comply is a criminal offence under the Food Safety Act 1990, and FSA inspectors can issue improvement notices or initiate prosecution.

US FDA Allergen Labelling: A Different Framework

The United States operates under the Food Allergen Labeling and Consumer Protection Act (FALCPA) of 2004, as amended by the FASTER Act of 2021. The FDA enforces these requirements for most packaged foods, while the USDA covers certain meat, poultry, and egg products. The US framework is meaningfully different from the UK/EU approach in several important respects, so if you are a British Shopify merchant exporting to the US, you cannot simply reprint your UK labels.

The original FALCPA identified eight major allergens: milk, eggs, fish, shellfish (crustacean), tree nuts, peanuts, wheat, and soybeans. The FASTER Act added sesame as a ninth major allergen, effective 1 January 2023 — a change that forced thousands of manufacturers to reformulate or relabel products, since sesame was previously often used as a shared-equipment disclosure rather than a declared ingredient. Under US rules, each tree nut must be identified by its common name (e.g. "almonds" or "cashews"), not simply listed as "tree nuts."

US labelling rules require allergens to be declared in one of two ways: either in the ingredients list in plain language, or in a separate "Contains" statement immediately following the ingredient list (e.g. "Contains: wheat, milk, soy"). Unlike the UK bold-text emphasis requirement, the US "Contains" statement approach is optional but widely used by manufacturers. Critically, the US does not require declarations for celery, lupin, molluscs, mustard, or sulphites at the same regulatory threshold as the UK — meaning a product compliant in both markets needs careful label engineering to satisfy both sets of rules simultaneously.

EU Allergen Labelling: Where It Sits Post-Brexit

The European Union continues to operate under Regulation (EU) No 1169/2011 on food information to consumers, which applies to all pre-packed food placed on the EU market. Since the UK retained this regulation post-Brexit, the substance of UK and EU allergen rules is currently very similar — both require the same 14 allergens to be emphasised in the ingredients list. However, the EU and UK are now independent regulatory systems, and any future divergence (for example, if the UK adds or removes allergens from its list) will create new compliance obligations for merchants selling into both markets.

For Shopify merchants shipping into the EU, the key practical point is that your labels must comply with EU FIC requirements, which are enforced at the national level by member state food safety authorities. In Germany, for example, the Bundesamt für Verbraucherschutz und Lebensmittelsicherheit (BVL) can act on non-compliant imports, while France's DGCCRF regularly conducts market surveillance. The consequence of non-compliance is typically product withdrawal, though repeat offences or serious risks to consumers can result in financial penalties and public recalls.

One area where the EU is actively diverging from current practice is digital labelling. The European Commission has been exploring whether QR codes and online databases can supplement or replace physical label information. This has significant implications for Shopify merchants, since digital product pages may eventually count as part of the legal information disclosure framework. Until formal changes are adopted, however, physical pre-packed food sold into the EU must carry a physical label meeting all FIC requirements — digital-only disclosure is not currently compliant.

Comparing the Three Regimes Side by Side

The most practical way to understand the differences is to think about the allergen list, the disclosure format, and the enforcement model as three separate variables. On the allergen list: the UK and EU both require declarations for 14 allergens; the US requires declarations for 9. Lupin, celery, molluscs, and mustard are required in the UK and EU but not in the US — so a product containing lupin flour needs explicit UK/EU labelling but has no equivalent US requirement.

On disclosure format, the UK mandates bold text emphasis within the ingredients list and does not require a separate "Contains" statement, though many manufacturers include one as additional clarity. The US permits either in-text identification or a "Contains" statement, giving manufacturers more formatting flexibility. The EU follows the same emphasis approach as the UK. Where a product is sold across all three markets, the practical solution is to use bold emphasis in the ingredients list (satisfying UK and EU) and add a "Contains" statement covering all allergens present (satisfying US expectations).

On enforcement, all three regimes have teeth, but the models differ. UK enforcement is largely local authority-driven, with the FSA providing national oversight and guidance. US enforcement is federal, with the FDA conducting inspections, issuing warning letters, and overseeing recalls — the FDA's public recall database is a useful benchmarking tool. EU enforcement is national but harmonised through EFSA scientific opinions and Commission guidance. For Shopify merchants, the practical upshot is that you may face enforcement from multiple directions if you are exporting, and a single labelling standard that meets the most stringent requirements in all three markets is the most defensible approach.

Managing Allergen Labelling on Your Shopify Store

Understanding the regulatory framework is one thing; operationalising it across a Shopify product catalogue is another. Most Shopify merchants start by managing allergen information in spreadsheets, which works at low SKU volumes but becomes error-prone as the catalogue grows. A single reformulation — changing a supplier, substituting an ingredient, or adding a new flavour variant — can invalidate multiple product listings simultaneously if your allergen data is not structured and linked correctly.

The Allergen Matrix app was built specifically to address this problem for Shopify merchants. It lets you define ingredient-level allergen data once and propagate it automatically across all product listings, so a supplier change updates every relevant product page in one action rather than requiring manual edits across dozens of listings. This is particularly valuable for merchants selling across UK, EU, and US markets simultaneously, where the same underlying allergen data needs to be rendered in different disclosure formats depending on the storefront.

For merchants early in their compliance journey, the most important first step is an honest audit of your current product listings. For each SKU, document every ingredient and every supplier, cross-reference against the allergen lists for each market you sell into, and confirm that your current labelling format meets the emphasis and disclosure requirements in each jurisdiction. This audit is not a one-time exercise — it should be part of your standard operating procedure for any new product launch or reformulation.

Common Mistakes That Lead to Enforcement Action

The allergen labelling mistakes that most commonly attract enforcement attention are not obscure edge cases — they are predictable errors that a structured review process would catch. Composite ingredient failures are among the most frequent: a manufacturer lists "mayonnaise" as an ingredient without declaring that the mayonnaise contains eggs and mustard, both of which are controlled allergens in the UK and EU. Under FIC rules, sub-ingredients of compound ingredients must be declared if they are allergens, unless the compound ingredient appears on an approved list of standard recipes.

A second common failure is inconsistency between physical labels and digital listings. Shopify product pages are increasingly treated as part of the information environment around a product — and in a regulatory context, a customer who suffers an allergic reaction after relying on incorrect online information has a potential claim regardless of what the physical label says. Keeping your Shopify product descriptions, ingredient declarations, and allergen information synchronised with your physical labels is not just good practice; it is increasingly a legal expectation in consumer protection frameworks across the UK, US, and EU.

A third recurring issue is "may contain" advisory labelling used as a substitute for positive allergen declaration. Precautionary allergen labelling (PAL) — statements like "may contain traces of nuts" — is intended to communicate genuine cross-contamination risk, not to replace mandatory allergen declarations. Using PAL language on a product that actually contains a controlled allergen as an ingredient is a regulatory violation, and it also creates significant civil liability if a consumer suffers a reaction.

Conclusion

Allergen labelling compliance across the UK, US, and EU requires food businesses to navigate three different allergen lists, two different disclosure formats, and multiple enforcement regimes — all while keeping Shopify product listings accurate and up to date. The core principle is consistent: controlled allergens must be clearly declared, whether through bold text in an ingredient list or a "Contains" statement. The practical challenge is ensuring that your labelling infrastructure keeps pace with product changes, supplier updates, and regulatory evolution. Building a structured, systematic approach to allergen data management is not just a compliance exercise — it is a customer safety commitment that your brand depends on.

Key takeaways: UK and EU require 14 allergens with bold emphasis; the US requires 9 with more flexible formatting; lupin, celery, mustard, and molluscs are controlled in UK/EU but not the US; "may contain" is not a substitute for positive declaration; and digital listings carry legal weight alongside physical labels.

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