Gluten-Free, Decoded.
"Gluten-free" on a UK food label means a specific thing — less than 20 parts per million (ppm) of gluten, verified to standard. "Very low gluten" is below 100 ppm. Oats are not always gluten-free even when they look it. Barley malt vinegar is mostly safe; barley malt extract is not. Decoded by category. Free. Open. No paywall.
UK gluten-free labelling is governed by retained EU Regulation 828/2014. Coeliac UK accreditation provides additional verification. This reference is the companion deep-dive to the gluten section in our 14 UK Allergens page. For diagnosed coeliac disease, always read the label every time and confirm with the producer if uncertain.
Methodology · Sources · Caveats
Why this matters. For people with coeliac disease, gluten exposure causes immune-mediated damage to the small intestine. Even traces matter. The 20 ppm threshold for "gluten-free" labelling is not zero gluten — it's the level at which Codex and EFSA judged the cumulative daily intake from naturally-low-gluten foods to be safe for the great majority of people with coeliac disease. Some individuals are sensitive below 20 ppm; the threshold is a regulatory floor, not a personal-tolerance ceiling.
Coeliac disease vs wheat allergy vs non-coeliac gluten sensitivity. These three conditions are different. Coeliac disease is an autoimmune condition triggered by gluten; the gluten-free diet is the only treatment. Wheat allergy is an IgE-mediated allergy to wheat proteins (not specifically gluten) — sufferers may tolerate other gluten-containing cereals (barley, rye) but must avoid wheat. Non-coeliac gluten sensitivity is a less-defined condition with overlapping symptoms; gluten-free is symptomatic relief rather than a treatment for an underlying condition.
The Codex 20 ppm threshold. 20 mg of gluten per kg of food (= 20 ppm). The Codex Alimentarius standard, retained in UK law via Regulation 828/2014. Products labelled "gluten-free" must test below this threshold. Products labelled "very low gluten" must test below 100 ppm.
Oats and the cross-contamination question. Oats are botanically gluten-free but are usually grown, harvested, milled, or processed alongside wheat, barley, or rye, leading to gluten cross-contamination. "Gluten-free oats" (Coeliac UK accredited) are oats grown and processed in a controlled gluten-free supply chain. Even pure oats contain avenin, a protein similar to gluten that triggers symptoms in a small subset of coeliacs.
Sources. Retained EU Regulation 828/2014 on gluten-free labelling; Codex Alimentarius Standard 118-1979 (rev. 2008); Coeliac UK guidance; EFSA NDA Panel opinions on gluten and coeliac disease; UK Food Standards Agency.
Verdicts. Contains gluten — this ingredient or product contains gluten and is not safe for coeliac disease. Verify before consuming — status depends on certification, source, or processing; check the bolded allergens or producer. Naturally gluten-free — ingredient or product does not contain gluten by composition.
What this is not. Not medical advice. For diagnosed coeliac disease, always read the label every time, look for highlighted gluten-containing allergens, look for a "gluten-free" claim or Coeliac UK Crossed Grain symbol, and contact the producer if uncertain.
Why this is free. Per SCANSMART's Belongs-to-Everyone Rule.
Sources
- Retained EU Regulation 828/2014 — gluten-free and very low gluten labelling rules
- Codex Alimentarius Standard 118-1979 — the international 20 ppm standard
- Coeliac UK — the Crossed Grain symbol, accredited gluten-free oats, the Food & Drink Information Service
- EFSA NDA Panel — opinions on gluten thresholds and coeliac disease
- UK Food Standards Agency — consumer guidance on gluten and coeliac disease
- Food Information Regulations 2014 — cereals containing gluten as an allergen category
Reflects UK law as of May 2026.
Where this reference connects.
For deeper evidence-vault treatment connecting this reference to the SCANSMART analytical framework, see: Impulse Buying Triggers · Food Marketing to Kids · Brand vs Manufacturer · Reformulation Tracking · Cultural Food Myths · Global Staple Foods (non-wheat staples for gluten-free households: sorghum, millet, teff, quinoa, buckwheat, cassava) · Dietary Patterns · Carbohydrate Types · Caffeine and Health · Industry Funding Bias in Nutrition Research · UPF Brain & Cognitive Claims · Children’s Oral Health · Behaviour Change & Decision-Point Capture.
Reference-format consistency pass · 11 May 2026 · Stale-date reminder: re-check after next Coeliac UK guidance and EFSA gluten-free claim register updates. For coeliac diagnosis and management, consult a qualified clinician; this reference is not medical advice · SCANSMART is a food literacy and decision-support platform. It is not a medical device and does not provide medical advice.