Prices are approximate and vary by restaurant. Last updated September 2026.
Eating out with a food allergy requires trust, preparation, and good information. McDonald’s UK publishes detailed allergen information for its menu, which is a solid starting point — but fast-food kitchens are busy, shared environments, and there are limits to what any guide (including this one) can promise.
This independent, practical guide explains how to find McDonald’s UK allergen information, how to interpret it, and how to order as safely as possible if you or someone you are ordering for has an allergy or intolerance.
Where to Find Official Allergen Information
McDonald’s UK publishes allergen information on its official website, covering every standard menu item. This is the single source you should rely on — not this article, not a blog post from 2022, not a screenshot on social media. Recipes and suppliers change, and only the current official information reflects what is actually being served today.
You can also find allergen information:
- In the MyMcDonald’s app, alongside menu items when ordering.
- In restaurants, where staff can provide allergen information on request. Every restaurant holds current allergen data for its menu.
- On delivery platforms (Uber Eats, Just Eat, Deliveroo), which typically display allergen information for menu items.
Make checking the current official information a habit every time you order, not just the first time. A recipe change between visits can alter an item’s allergen profile without any fanfare.
The 14 Major Allergens
UK food law recognises 14 major allergens that must be declared, and McDonald’s allergen information covers all of them:
- Celery
- Cereals containing gluten (wheat, rye, barley, oats)
- Crustaceans (prawns, crab, lobster)
- Eggs
- Fish
- Lupin
- Milk
- Molluscs (mussels, squid, etc.)
- Mustard
- Nuts (almonds, hazelnuts, walnuts, etc.)
- Peanuts
- Sesame seeds
- Soya
- Sulphur dioxide and sulphites
Scanning a menu item against this list is the core skill. For example: burger buns typically contain gluten, sesame, and soya; McMuffins contain gluten, egg, and milk; many sauces contain mustard, egg, or soya. The official guide lists each item’s allergens explicitly, so you do not have to guess — but understanding the usual suspects helps you sanity-check what you read.
Common Allergen Profiles on the Menu
Without replacing the official guide, here are some general patterns that help set expectations:
- Burgers: Buns almost always contain gluten and sesame; beef patties are typically just beef and seasoning, but cheese adds milk and some sauces add mustard, egg, or soya.
- Chicken items: Breading usually contains gluten; some marinades and coatings contain other allergens.
- Breakfast items: Egg and milk feature heavily (McMuffins, wraps, porridge); sausage patties contain gluten and other ingredients.
- Fries: In the UK, fries are cooked in vegetable oil and the standard recipe is free from most major allergens — but check the current guide, as coatings or flavourings can change.
- Desserts: McFlurry and sundae bases contain milk; mix-ins introduce nuts, gluten, soya, and egg depending on the flavour. This is the highest-risk category for nut allergies in particular.
- Salads and fruit: Generally the lowest-risk items, but dressings add allergens — check before adding.
These are patterns, not promises. Always verify against the current official information.
Cross-Contamination: The Honest Truth
This is the most important section of this guide. McDonald’s kitchens are high-volume, shared environments where many allergens are handled throughout the day. Key facts:
- Food cannot be guaranteed allergen-free. McDonald’s states this plainly, and we repeat it here because it matters: even an item whose recipe contains none of your allergens may come into contact with them during storage, preparation, or cooking.
- Fryers are shared by product type. Fries have dedicated fryers, but other fried items may share oil with products containing different allergens.
- Grills and toasters are shared. Burgers, chicken, and buns pass through the same equipment during a busy service.
- The McPlant is an exception worth noting: it is cooked on a separate grill with dedicated utensils, which is a higher standard of separation than most menu items receive. But even so, it is prepared in the same kitchen.
What this means in practice: if you have a mild intolerance or preference, the official allergen guide plus sensible choices will usually serve you well. If you have a severe allergy, especially to nuts, or a condition like coeliac disease, you need to weigh the cross-contamination risk seriously — and for some people, the right decision is not to eat there. That is not McDonald’s failing; it is the reality of fast-food kitchens.
Ordering Safely: Practical Steps
If you decide to order, these steps reduce risk:
- Check the current official allergen information before every order. Not last month’s — today’s.
- Tell the staff about the allergy. When ordering in person, mention it clearly. Staff are trained to take allergy information seriously and can advise on preparation.
- Keep the order simple. Fewer components means fewer points of contact. A plain hamburger has a simpler allergen profile than a fully loaded limited-edition burger with three sauces.
- Be cautious with customisation. Removing an allergen ingredient (e.g., “no cheese”) reduces the recipe risk but does not eliminate cross-contact risk from shared equipment.
- Double-check delivery orders. When ordering via Uber Eats, Just Eat, or Deliveroo, review the allergen information shown in the app, and consider adding an allergy note to the order where the platform allows it.
- For children with allergies, an adult should verify the information and communicate with staff — do not delegate this to the child.
Gluten-Free and Coeliac Considerations
McDonald’s UK does not market a gluten-free menu as such, and the prevalence of buns, breading, and shared toasters/grills makes it a challenging environment for coeliac diners. Some items are naturally free from gluten-containing ingredients in their recipes (certain salads, fruit bags), but the shared-kitchen cross-contact risk applies. If you have coeliac disease, read the official guidance carefully and make your own judgement — many coeliacs choose to avoid fast-food kitchens entirely, and that is a reasonable, informed choice.
Dairy, Egg, and Nut Allergies
- Milk/dairy: Present across cheese, milkshakes, McFlurry bases, porridge (made with milk), and many sauces and buns. One of the hardest allergies to navigate on this menu.
- Egg: Central to the breakfast menu (McMuffins, wraps, scrambled egg) and present in many sauces and coatings.
- Peanut/tree nut: Less pervasive in savoury items, but desserts are the danger zone — McFlurry mix-ins, sundae toppings, and promotional items can contain nuts. Nut-allergy sufferers should treat the dessert menu with particular caution and always check.
Frequently Asked Questions
Where can I find McDonald’s UK allergen information?
On McDonald’s official UK website, in the MyMcDonald’s app, from restaurant staff on request, and on delivery platforms alongside menu items. Always use current official information.
Can McDonald’s guarantee food is allergen-free?
No. Kitchens handle many allergens in a shared, high-volume environment, so food cannot be guaranteed free from any allergen. This is stated plainly in McDonald’s own guidance.
Are McDonald’s fries gluten-free?
UK fries are cooked in vegetable oil and the standard recipe does not include gluten-containing ingredients — but recipes and suppliers can change, and cross-contact in the kitchen is possible. Check the current official allergen guide and assess your own risk tolerance.
What should I do if I have a severe nut allergy?
Check the current official allergen information, be particularly cautious with desserts and limited-edition items, tell staff about the allergy, and seriously consider whether the shared-kitchen environment meets your safety needs.
Can I customise an order to remove an allergen?
Yes — you can ask for items to be made without specific ingredients (e.g., no cheese, no sauce). This changes the recipe but does not eliminate cross-contamination risk from shared equipment.
Is the McPlant safe for people with allergies?
The McPlant is cooked on a separate grill with dedicated utensils, which reduces cross-contact risk compared with other items — but it is still prepared in a shared kitchen, and its own recipe contains allergens (including soya and gluten ingredients). Check the official guide.
Conclusion
McDonald’s UK provides thorough, accessible allergen information — and that is genuinely to its credit. Use it every time you order, communicate with staff, keep orders simple, and be realistic about shared-kitchen risks. For mild intolerances, the system works well. For severe allergies, the information is there to help you make an informed decision — including, when appropriate, the decision to eat elsewhere. Good allergen practice is not about fear; it is about having the facts and acting on them.