Triple Stacker King: Allergens at a Glance
The honest verdict
Triple Stacker King · Burger King
The Triple Stacker King is a Burger King burger with three beef patties, American cheese, bacon, and Stacker sauce on a sesame seed bun. The allergen profile is anchored by wheat from the bun, milk from the cheese, egg from the mayonnaise in the Stacker sauce, and sesame from the seeded bun. Soy may appear in the bun or sauce. Peanut, tree nut, fish, and shellfish are not typical ingredients. Cross-contact via shared grills and fryers is a real concern. Always confirm with your specific Burger King location before ordering, as recipes and suppliers vary by region.
Allergen details change and vary by location. This is a general guide — always confirm with the restaurant before ordering. Not official or medical advice.
Key facts
The Triple Stacker King bun is sesame-seeded, making it a direct source of sesame — the 9th major allergen under the FASTER Act.
Burger King's Stacker sauce is mayonnaise-based, containing egg — a primary egg source in this burger.
American cheese on the Triple Stacker King contains milk, making this burger a dairy-containing item even without additional cheese.
Every major allergen, one clear grid
Each of the nine major allergens marked for Triple Stacker King at Burger King — Contains, May contain (cross-contact or varies), or Free. Anything we couldn't confirm defaults to "may contain," because a shared kitchen can't be ruled out without the restaurant's official menu.
| Allergen and notes | Status |
|---|---|
Milk American cheese slices contain milk. The Stacker sauce may also contain milk derivatives. This is a primary milk source in the burger. | Contains |
Egg The Stacker sauce is mayonnaise-based and contains egg. Burger King's standard mayonnaise includes egg yolks. | Contains |
Wheat / Gluten The sesame seed bun is wheat-based. All Burger King sandwich buns contain wheat flour. | Contains |
Soy Soybean oil may be used in the bun or sauce. Burger King's buns and sauces can contain soy lecithin or soybean oil. Highly refined soy oil is typically tolerated, but those with severe soy allergy should confirm. | May contain |
Peanut Peanut is not a listed ingredient in any component of the Triple Stacker King. Cross-contact is very unlikely in Burger King kitchens. | Free |
Tree Nut Tree nuts are not an ingredient in the burger patties, cheese, bacon, sauce, or bun. | Free |
Fish Fish is not an ingredient in the Triple Stacker King. Burger King does not fry fish in the same oil as burger components, though cross-contact via shared grills is theoretically possible. | Free |
Shellfish Shellfish is not an ingredient in any component of this burger. | Free |
Sesame The bun is topped with sesame seeds. This is a direct source of sesame. Burger King's standard hamburger buns are sesame-seeded. | Contains |
“May contain” means cross-contact is possible or the answer varies by location — not that the allergen is a listed ingredient. For a severe allergy, treat “may contain” the same as “contains” until the restaurant confirms otherwise.
Small changes that remove an allergen
Simple modifications that can take an allergen off your triple stacker king. Always name your allergy when you order and ask staff to confirm — a modification only helps if the kitchen prepares it separately.
Order without cheese
Order without Stacker sauce (or request ketchup/mustard instead)
Request a lettuce wrap or bunless preparation
Ask for a bun without sesame seeds if available
A modification lowers exposure but doesn't erase cross-contact from shared fryers, grills, or prep surfaces. For a severe allergy, confirm the prep with a manager before you eat.
Read this before you order
Cross-contact & severe allergies
A “free of” mark on the grid above means the allergen isn't an ingredient — it doesn't mean the item was made in an allergen-free kitchen. Two things matter most:
Shared fryers & equipment
Burger King uses shared grills for all burger patties, and the same prep surfaces for assembling sandwiches. While the Triple Stacker King components are individually prepared, cross-contact with other menu items (including those containing fish, soy, or other allergens) is possible via utensils, gloves, or grill surfaces. Burger King does not guarantee allergen-free preparation. Ask staff about dedicated prep practices at your location.
If your allergy is severe
For anaphylactic allergy to wheat, milk, egg, or sesame, the Triple Stacker King is not a safe choice without restaurant-level confirmation. The bun, cheese, and sauce are core components that cannot be fully removed without fundamentally changing the item. Cross-contact on shared grills and prep surfaces is a real risk. Carry your epinephrine auto-injector. If you cannot confirm preparation details, consider a different menu item with fewer allergen-containing components.
This guidance is general and can't account for how any single location prepares your food. The restaurant's staff and official allergen menu are the final word — when in doubt, ask, or choose something else.
Avoidance is not the only option for milk allergy
There is no FDA-approved immunotherapy for milk allergy. Some specialist centres offer milk oral immunotherapy off-label, and Xolair is approved to reduce the severity of reactions to accidental exposure across IgE-mediated food allergies.
Beyond that, oral immunotherapy in a specialist clinic raises reaction thresholds the most of any current approach, and sublingual immunotherapy raises them less but causes markedly fewer reactions and is easier to keep up over years. Neither makes any particular dish safe to eat, and an epinephrine auto-injector stays with you throughout.
A history of anaphylaxis, or severe or poorly controlled asthma alongside the food allergy, means this belongs with an in-person allergist rather than any remote service.
Frequently Asked Questions
Both use a sesame seed bun and mayonnaise, so wheat, egg, and sesame are common. The Triple Stacker King adds a third beef patty, American cheese (adds milk), and bacon — the Whopper has lettuce, tomato, onion, pickles, and ketchup instead. The Stacker sauce is mayonnaise-based (egg), similar to Whopper mayo. The cheese on the Stacker is the main milk difference — the Whopper is typically ordered without cheese unless specified.
Yes. The sesame seed bun is made from wheat flour, which contains gluten. There is no gluten-free bun option at Burger King in most markets. A lettuce wrap or bunless preparation removes the wheat, but confirm that the burger is prepared on a clean surface away from bun crumbs and shared utensils.
The Stacker sauce is primarily mayonnaise-based (egg), but it may contain milk derivatives depending on the recipe at your location. Burger King's standard Stacker sauce ingredients vary by region. If dairy is a concern, request the burger without sauce or substitute ketchup and mustard, which are typically dairy-free.
The standard bun at Burger King is topped with sesame seeds. Some locations may have plain buns available upon request, but this is not guaranteed. If sesame allergy is a concern, a bunless preparation (lettuce wrap or bowl) is the most reliable way to avoid sesame entirely. Confirm with the restaurant whether any other components contain sesame.
Burger King publishes an allergen and nutrition PDF on their website for US locations, which includes the Triple Stacker King. However, this information can change with supplier updates and varies internationally. Always check the current allergen menu at bk.com and confirm with your local restaurant, as ingredient sourcing and preparation methods differ by franchise and region.
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Read moreFind out which foods you actually react to
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Please verify before ordering
Allergen info changes and varies by location
Recipes, suppliers, and preparation methods change often and differ between locations, so the details here can go out of date or not match your specific Burger King restaurant. Always confirm directly with the restaurant and check its official allergen menu before ordering. This page is a general research summary — it is not official information from Burger King, and it is not medical advice. If you have a food allergy, decisions about what is safe to eat should be made with the restaurant and, where relevant, your healthcare provider.
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