Food allergens are specific proteins found in certain foods that trigger an abnormal immune response in sensitized individuals, resulting in symptoms that range from mild oral allergy syndrome to life-threatening anaphylaxis. Approximately 2–4% of adults and 6–8% of children in the EU are estimated to have a clinically confirmed food allergy. Food intolerance (such as lactose intolerance or reactions to sulphites) involves non-immune mechanisms and is distinct from IgE-mediated allergy, but is equally important from a regulatory standpoint.
Under Regulation (EU) No 1169/2011 (Food Information to Consumers Regulation), 14 substances or product groups are designated as major allergens requiring mandatory declaration whenever they are present as ingredients in any food product sold in the EU. These 14 allergens must be emphasized (e.g., in bold, italics, or contrasting colour) in the ingredient list of packaged foods. For non-prepacked food (including restaurant and catering food), allergen information must also be communicated — either in writing or verbally — since December 2014.
The 14 mandatory EU allergens (Annex II, Regulation (EU) No 1169/2011) are: cereals containing gluten (wheat, rye, barley, oats, spelt, khorasan wheat), crustaceans, eggs, fish, peanuts, soybeans, milk (including lactose), nuts (almonds, hazelnuts, walnuts, cashews, pecan, Brazil, pistachio, macadamia), celery, mustard, sesame seeds, sulphur dioxide and sulphites (at concentrations >10 mg/kg or 10 mg/L expressed as SO⊂2;), lupin, and molluscs.
Laboratory testing is essential for verifying label compliance, detecting cross-contamination, and validating cleaning procedures. Ovalab’s allergen detection service uses validated ELISA and PCR methods to quantify allergenic proteins and DNA across all 14 regulated allergens in complex food matrices.
Analytical Methods
- ELISA (Enzyme-Linked Immunosorbent Assay) — Primary quantitative protein-based method for allergen detection. Highly sensitive (detection limits typically 0.1–5 mg/kg of allergenic protein). Species-specific antibodies enable individual allergen quantification. Commercial ELISA kits are available for all 14 EU-regulated allergens. Best suited for routine compliance testing.
- PCR (Polymerase Chain Reaction) — DNA-based method offering high specificity for species identification. Particularly useful when food processing has degraded proteins (rendering ELISA unreliable) or when genetically modified (GM) ingredient verification is needed. Real-time quantitative PCR (qPCR) allows semi-quantitative assessment. See the PCR glossary entry for full details.
- LC-MS/MS (Liquid Chromatography-Tandem Mass Spectrometry) — Protein/peptide-based confirmatory method offering simultaneous detection of multiple allergens from a single run. Detects specific marker peptides unique to each allergenic species. Increasingly used as a reference method, especially for highly processed or heated matrices where antibody-based assays may underperform.
- Lateral Flow Immunoassay (LFIA) — Rapid qualitative or semi-quantitative screening strips for on-site use, particularly for environmental swab testing and incoming goods inspection. Results within 5–15 minutes. Positive results require confirmation by quantitative ELISA or LC-MS/MS.
EU Regulatory Framework
Food allergen labelling in the EU is primarily governed by Regulation (EU) No 1169/2011 (Food Information to Consumers — FIC Regulation), which took full effect on 13 December 2014. Key provisions include:
- Annex II — Lists the 14 substances/product groups requiring mandatory declaration, regardless of quantity (except sulphites, which require declaration only when present at >10 mg/kg or 10 mg/L as SO⊂2;).
- Article 21 — Requires allergens to be emphasized in the ingredient list through typographic means (e.g., bold, italics, different colour). Where no ingredient list exists, the allergen must still be declared.
- Article 44 — Extends allergen communication requirements to non-prepacked and catering food, effective December 2014. Allergen information must be available in writing or verbally.
- Commission Implementing Regulation (EU) 2021/382 — Lays down allergen management and precautionary labelling practices for food businesses (specific to unpackaged food).
Precautionary allergen labelling (PAL), such as “may contain traces of…”, is voluntary under EU law and not regulated by Regulation (EU) No 1169/2011. EFSA and the Commission have published guidance on threshold levels to support future regulatory harmonization of PAL.
Frequently Asked Questions
How many food allergens must be labelled under EU law?
Under Annex II of Regulation (EU) No 1169/2011, exactly 14 substances or product groups must be declared whenever present as ingredients in any EU food product: cereals containing gluten (wheat, rye, barley, oats, spelt, khorasan wheat), crustaceans, eggs, fish, peanuts, soybeans, milk (including lactose), nuts (8 specific tree nuts), celery, mustard, sesame seeds, sulphur dioxide/sulphites (>10 mg/kg or 10 mg/L), lupin, and molluscs.
What is the difference between food allergy and food intolerance?
A food allergy involves an IgE-mediated immune response to a specific food protein, causing symptoms such as urticaria, angioedema, asthma, or anaphylaxis within minutes to 2 hours of exposure. Even trace amounts can trigger severe reactions. Food intolerance (e.g., lactose intolerance, sulphite sensitivity) is a non-immune dose-dependent reaction causing digestive symptoms or other effects, typically requiring larger quantities. Both are covered by EU allergen labelling law under Regulation (EU) No 1169/2011.
Can ELISA or PCR detect allergens in highly processed foods?
Both methods have limitations in highly processed foods. ELISA detects proteins, which can be denatured by heat or processing, potentially reducing assay sensitivity. PCR detects DNA, which is more heat-stable but can also be degraded by extreme processing. For highly processed matrices (e.g., roasted, hydrolyzed, or fermented products), LC-MS/MS targeting stable marker peptides is the preferred confirmatory method, as it maintains high specificity even when proteins are partially denatured.
Is precautionary allergen labelling ('may contain') regulated in the EU?
No. Precautionary allergen labelling (PAL) such as “may contain traces of peanuts” is not regulated under EU law and is used voluntarily by food businesses to communicate cross-contamination risks. This inconsistency has been criticized as it may reduce trust and cause over-avoidance by allergic consumers. EFSA has published scientific opinions on allergen threshold levels, and the EU Commission is developing guidance on harmonizing PAL. In the meantime, food business operators are responsible for allergen risk management under Regulation (EC) No 178/2002 and HACCP principles.
How does allergen testing support food safety management?
Laboratory allergen testing supports food businesses at multiple control points: incoming goods verification (confirming supplier allergen status), in-process sampling (monitoring cross-contamination during shared-line production), cleaning validation (verifying allergen removal by swab testing after sanitation), and finished product testing (label compliance verification). Accredited laboratories under ISO/IEC 17025 provide validated quantitative results that can defend compliance with Regulation (EU) No 1169/2011 requirements.