Eating at In-N-Out with celiac disease, IBS or food allergies

It depends on what you need to avoid, and on what In-N-Out says about its own kitchens. As of October 2026, In-N-Out’s Nutrition Info page lists the ingredients and allergens for each item, and states: "Please be advised that our food is prepared in kitchen spaces where cross-contact with allergens may occur." It adds that ingredients may vary based on regional availability, seasonal changes or supplier substitutions.

The menu is short: burgers, fries, shakes and drinks, plus a few add-ons. That makes the ingredient lists easier to read than at many chains, but it doesn’t make any item free from cross-contact. This guide summarizes what In-N-Out’s own pages list, so you can see where wheat, milk, egg, soy and common FODMAP sources appear, and what to ask. It isn’t a list of "safe" choices.

In-N-Out breaks each burger into its parts. These are the components listed on its Nutrition Info page when we checked in October 2026. They describe what In-N-Out lists, not recommendations.

Two details are easy to miss. First, the bun’s footnote mentions sesame in the facility, even though sesame isn’t an ingredient. If you have a sesame allergy, that "possibly on the same line" wording matters. Second, sulfites in the chopped chilies aren’t one of the nine major US allergens the FDA lists, but they are one of the 14 allergens labeled in the EU and UK, so they’re worth knowing about if you react to them.

In-N-Out’s page also shows a burger made with mustard and ketchup instead of spread, which removes the egg-containing spread, and a Protein Style burger with the bun replaced with lettuce, which removes the wheat-containing bun.

As of October 2026, the In-N-Out bun lists wheat, wheat gluten, malted barley flour and malt. The Celiac Disease Foundation lists malt and malted barley flour among sources of gluten, so reading the full ingredient list, not only the allergen line, helps you catch barley.

Protein Style removes the bun from the order, but In-N-Out doesn’t describe it as gluten-free, and its cross-contact statement covers the whole kitchen. The pages we checked don’t say how buns are toasted, whether gluten-free orders use a separate surface or utensils, or what else shares the fryer oil. These are fair questions to ask at your restaurant.

The french fries list potatoes, sunflower oil and a seasoning of salt, black pepper and canola oil, with no allergens listed. The Celiac Disease Foundation notes that fries can pick up gluten through cross-contact from shared fryers, so ask what else is cooked in the same oil if it matters for you.

Whether a shared kitchen is an acceptable risk is a personal decision, ideally made with your gastroenterologist or a registered dietitian. Our guides to eating out with celiac disease and gluten-free vs celiac-safe explain the difference between "no gluten ingredients" and "prepared to avoid cross-contact".

The facility notes are the kind of "may contain" information that matters if you have an egg, soy, milk or tree nut allergy. They come from the supplier side, separate from what happens in the restaurant kitchen.

For lactose intolerance, the shakes are made with a real ice cream mix of milk, cream and condensed skim milk. Monash lists cow’s milk and ice cream among higher-lactose foods. How much you tolerate is personal; our lactose intolerance guide covers this.

Based on In-N-Out’s ingredient lists as of October 2026, the common FODMAP sources are concentrated in a few places:

• Onion: fresh or grilled onion on the burgers, and onion powder in the spread and ketchup.
• Garlic: garlic powder in the spread and mustard, and garlic oil in the pickles.
• Wheat: in the bun. Monash lists wheat-based breads among higher-FODMAP foods.
• Lactose: in the shakes and the coffee creamer.

Monash lists potato as a lower-FODMAP vegetable, and garlic and onion as higher in FODMAPs. Asking for no onion and swapping the spread for something you tolerate are simple starting points. Whether fried food in general sits well with you is personal, and portion size can make a difference. See our guides to hidden garlic and onion and eating out with IBS for more ideas.

1. Check the current ingredients first on In-N-Out’s Nutrition Info page. Each item lists its components and allergens.
2. Order the change from the start, such as Protein Style, no spread or no onion, rather than removing something later. FARE explains that removing an allergen from finished food is still cross-contact.
3. Tell the crew about an allergy or celiac disease when you order, not only the modification. Ask about shared grills, utensils and fryer oil.
4. Check your order when it arrives. If something you asked to leave off is there and you have an allergy or celiac disease, ask for a fresh one.
5. If you’re unsure, skip it. It’s fine to order less, choose something simpler, or eat elsewhere.

Our guide to burgers and fast food with food restrictions covers shared grills, buns and fryers in more detail.

• "I have celiac disease. Could you make this Protein Style, and change gloves and use a separate surface if you can?"
• "I have an egg allergy. Could you make this with no spread from the start?"
• "Is anything other than fries cooked in the fryer oil?"
• "Could I have it with no onion, and mustard or ketchup on the side?"
• "Can you show me the current allergen information for this item?"

For more on explaining your needs clearly, see talking to restaurant staff about allergies.