The safest habit is also the simplest: check the complete label on the actual pack every time. Front-of-pack claims can be useful, but the ingredients list and any precautionary warning carry the detail you need.
A five-step label check
- Confirm the exact product. Similar flavours, pack sizes and multipacks can use different recipes or production arrangements.
- Read the complete ingredients list. The 14 regulated allergens must be emphasised when intentionally used as ingredients—often in bold, CAPITALS or contrasting type.
- Look for the precise allergen. Peanut is separate from tree nuts. The regulated tree nuts should be named, such as cashew, walnut or pistachio.
- Check precautionary wording. Read any “may contain” or cross-contact statement near the ingredients list. It describes possible unintended presence, not an ingredient.
- Check again before eating. Make sure the product received is the one checked, especially after an online substitution or packaging redesign.
Ingredients and “may contain” answer different questions
Ingredients list
Tells you what was intentionally used to make the food. A regulated allergen must be emphasised when it is present as an ingredient.
Precautionary warning
Warns of a possible unintended presence caused by cross-contact. Wording such as “may contain” is voluntary and should be supported by a risk assessment.
Free-from claim
Is a positive assurance aimed at people avoiding that allergen and requires controls appropriate to that claim. It is not merely the absence of a warning.
Vegan claim
Describes intentional animal-derived ingredients; it is not, by itself, an allergy-safety claim. Check the ingredients and allergen information separately.
Easy to miss
“New recipe” is not the only sign that something changed.
A manufacturer can change a recipe, supplier, factory or cross-contact assessment. Packaging may look almost identical. Treat every purchase as a fresh check and contact the manufacturer if the wording is unclear for your allergy.
Online shopping, imports and food without a full label
When food is sold online or by telephone, required allergen information should be available before the purchase is completed and again when the food is delivered. Check the delivered pack because substitutions can defeat an earlier check.
Imported food sold in the UK still needs compliant information for the UK market. If the allergen wording, translation or ingredient names are unclear, do not try to infer safety from pictures or foreign-language emphasis.
Loose food and restaurant meals follow different presentation rules. Ask where the written allergen information is held and speak to staff about the current recipe and preparation process.
Frequently asked questions
Why are allergens shown in bold on UK food labels?
For prepacked food, any of the 14 regulated allergens used as ingredients must be emphasised within the ingredients list. Bold type is common, although another clearly contrasting format may be used.
Do I need to read the label every time?
Yes. Recipes, suppliers and manufacturing arrangements can change, so check the full label on the pack you are buying even if you have eaten the product before.
Does no ‘may contain’ warning mean there is no cross-contact risk?
Not necessarily. Precautionary allergen labelling is voluntary and should follow a risk assessment. Its absence is not the same as a free-from guarantee.
Are online allergen details enough?
Use the information shown before purchase, then check the physical product label again when it arrives because substitutions and product details can change.
Evidence base
Official sources
- FSA: Food allergy and intolerance Consumer guidance
- FSA: Allergen labelling for food manufacturers Ingredients and precautionary labelling
- FSA: Distance selling and allergen information Online and telephone orders