Warm, honest answers from people who live this. Not medical advice — for personal medical decisions, talk to your gastroenterologist or your national coeliac society.
What does "gluten free" on a label actually mean — is it completely gluten free?
No product labelled "gluten free" is literally zero gluten. The legal standard, in both the EU and the UK (and mirrored by the FDA in the US), is that a food can carry a "gluten free" claim only if it contains 20 parts per million (ppm) or less of gluten.
That threshold — 20ppm — was set after extensive scientific review and is the level at which no measurable harm occurs for the vast majority of people with coeliac disease. It is not a compromise born of commercial convenience; it reflects genuine toxicological evidence. Large-scale studies support that consistent exposure below 20ppm does not cause intestinal damage in most coeliacs.
The crossed grain symbol used by Coeliac UK and its international partners (the "GFF" certification mark) indicates a product has been independently tested and verified to meet that standard. It's a useful shortcut, though products without the symbol can still be labelled and certified gluten free through other routes — the symbol is one quality assurance mechanism, not the only one.
What the label does not guarantee is that every single batch is tested, or that manufacturing conditions never change. For most branded products in regulated markets, labelled gluten free is a reliable claim. For products with less transparent supply chains, or bought from market stalls or small producers without certification, more caution is warranted.
The practical takeaway: look for "gluten free" on the label or the crossed grain symbol. Both mean the 20ppm standard applies.
What does "may contain gluten" or "may contain wheat" mean — can I eat it?
This is one of the most misunderstood areas of coeliac labelling, and the confusion is understandable.
"May contain" statements (also called precautionary allergen labelling, or PAL) are voluntary in most jurisdictions. Manufacturers add them when there's a risk of cross-contact during production — a line that runs both wheat-containing and wheat-free products, for example. What the statement does not tell you is how significant that risk is. A tiny shared line in a facility that also makes gluten-free bread is a very different risk from a factory where 50% of production involves flour dust.
Coeliac UK's position, which aligns with most coeliac societies, is that products carrying "may contain gluten" or "may contain wheat" warnings should be avoided by people with coeliac disease. The reason: there's no standardised threshold that triggers the warning, no test to know how much potential contamination is involved, and no requirement to verify the claim.
In December 2025, the FAO/WHO published a new reference dose framework recommending that manufacturers should only use a "may contain gluten" label if the risk of gluten exceeding 4mg per serving cannot be ruled out — and that products meeting the less-than-20ppm standard should not carry precautionary warnings at all. This is a significant step toward more consistent labelling, but implementation will take time.
For now: if a product you'd expect to be safe carries "may contain gluten", the simplest rule is to avoid it unless you have specific information about the facility's practices.
What is the crossed grain symbol and should I only buy products that have it?
The crossed grain symbol — a stylised grain with a line through it — is the certification mark of the Association of European Coeliac Societies (AOECS) and is licensed to national coeliac societies including Coeliac UK, the Deutsche Zöliakie Gesellschaft (DZG), and their equivalents across Europe. In practice, it means the product has been independently audited and verified to contain less than 20ppm gluten.
It's a very useful shortcut. If you see the symbol, you can be confident the product meets the legal gluten-free standard and has had that claim independently checked.
But — and this is important — the absence of the symbol does not mean a product is unsafe. Many products are labelled "gluten free" without carrying the AOECS symbol. In regulated markets (EU, UK, US, Australia), the legal definition of "gluten free" applies to all products using that claim, with or without a certification logo. Supermarket own-brand ranges and many manufacturer products are tested and compliant without paying for third-party certification.
In practice: the crossed grain symbol is a reliable green light. A "gluten free" label without the symbol is usually also fine in regulated markets, though you might want to look more carefully at unfamiliar brands. No gluten-free claim at all, even if the ingredients look clean, leaves you without formal assurance — and that's where more caution is warranted.
Is malt extract gluten free? I keep seeing it in cereals and snacks.
Malt extract is almost always derived from barley, which is a gluten-containing grain. Standard malt extract is not gluten free and should be avoided by people with coeliac disease.
The confusion arises because some processed derivatives of wheat and barley — glucose syrup from wheat, for example — have their gluten removed during processing to the point where the final ingredient is genuinely gluten free. Malt extract does not work this way. The proteins responsible for the immune reaction in coeliac disease survive the malt extraction process, which means barley malt extract contains gluten at levels that can cause harm.
Where you'll most often encounter it: breakfast cereals (corn flakes and rice-based cereals very commonly contain malt extract or malt flavouring), some flavoured crisps, chocolate products, malted drinks like Horlicks or Ovaltine, and certain beers and spirits.
The rule is straightforward: if a product ingredient list shows malt extract, malted barley, malt flavouring, or malt vinegar, and it doesn't carry a "gluten free" label, it's not safe. Malt vinegar specifically is a frequent catch — many people know to avoid it on chips but forget to check the ingredient lists of bottled sauces and salad dressings where it often appears.
When a product is labelled gluten free and contains "wheat starch" or ingredients that sound like they should contain gluten, check the label — legally, it still has to meet the 20ppm standard. But malt extract without a gluten-free claim is a hard no.
The label says oats — does that mean it's not safe for me?
Oats are complicated, and the guidance on them isn't consistent across all coeliac societies — so here's where things currently stand.
Pure oats — oats that have not been contaminated with wheat, barley, or rye during growing, transport, or milling — are tolerated by the vast majority of people with coeliac disease. Research suggests that around 5% or fewer coeliacs have a reaction to the oat protein avenin itself. For most people, the risk from oats comes from contamination, not the grain itself.
The problem is that conventional oats are routinely cross-contaminated with gluten-containing grains throughout the supply chain. Standard supermarket porridge oats, even if they look plain, cannot be assumed to be gluten free. To eat oats safely, you need oats that are either produced under a purity protocol (grown, harvested, and milled with strict segregation) or mechanically/optically sorted to remove cross-contamination — and the product should carry a gluten-free label.
Gluten-free oats are available in most UK and European supermarkets and are marked accordingly. In the UK, Coeliac UK recommends that coeliacs can include certified gluten-free oats in their diet, but introduce them gradually to watch for tolerance. In some other countries, particularly Canada and some European markets, the guidance is more cautious.
If you've been newly diagnosed: wait until your gut has had some time to heal before introducing even certified GF oats. Then reintroduce them slowly and pay attention to how you feel.
What are the hidden gluten ingredients I'm most likely to miss on a label?
Most people learn quickly to spot wheat, barley, and rye. The harder ones are the less obvious forms — here are the ones that catch people out most often.
Malt vinegar — appears in many condiments, crisps, and sauces. Often listed simply as "vinegar" in some contexts, though in the EU and UK, the source must be declared.
Barley malt extract — extremely common in breakfast cereals, as above.
Spelt and kamut — ancient wheat varieties that are absolutely not gluten free, despite a persistent myth.
Wheat starch — can be either a problem or fine depending on whether it's been processed to remove gluten. If a product is labelled gluten free and contains wheat starch, it's a specially processed ingredient (called "codex wheat starch") that meets the 20ppm standard. If the product isn't labelled gluten free and lists wheat starch, avoid it.
Soy sauce — traditional soy sauce is brewed with wheat. Tamari is the usual wheat-free substitute, but check the label every time as formulations vary.
Stock cubes and gravy — frequently contain wheat flour or barley, even in brands you'd assume are safe.
Communion wafers — a real issue for practising Catholics; low-gluten rather than gluten-free wafers are used by the Catholic Church. Coeliac UK has guidance on this specific situation.
Medications and supplements — some tablet coatings and capsule fillers contain wheat starch. It's worth checking with your pharmacist, and Coeliac UK's food and drink information service can help with specific queries.
In the EU and UK, the 14 major allergens (including wheat, barley, rye, and oats where relevant) must be declared on pre-packaged food labels and emphasised — usually bolded or underlined — in the ingredient list. That makes reading UK and EU labels more reliable than labels from other markets where declaration requirements differ.