Double Bacon King: Allergens at a Glance
The honest verdict
Double Bacon King · Burger King
The Double Bacon King is a Burger King sandwich with two flame-grilled beef patties, bacon, American cheese, sliced onions, pickles, ketchup, and mayonnaise on a sesame seed bun. The allergen profile is anchored by wheat from the bun, milk from the cheese and mayo, and egg from the mayonnaise. Soy appears in the bun and as refined soybean oil used in the kitchen. Sesame is present on the bun (seeded variety). Peanut, tree nut, fish, and shellfish are not typical ingredients. This is a beef-based premium burger — different from the Whopper (single patty, tomato, lettuce) or chicken sandwiches (see crispy-chicken-sandwich). Cross-contact via shared grills and prep surfaces is possible. Always confirm with your specific Burger King location before ordering.
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 Double Bacon King's sesame seed bun is wheat-based, making the sandwich a direct source of gluten and sesame.
American cheese and mayonnaise in the Double Bacon King are direct sources of milk and egg allergens respectively.
FDA — Food Allergen Labeling and Consumer Protection Act (FALCPA)
Shared grills at Burger King for beef and fish patties create a potential cross-contact route for fish allergen.
Every major allergen, one clear grid
Each of the nine major allergens marked for Double Bacon 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.
- MilkContains
American cheese slices and mayonnaise both contain milk. The cheese is a direct dairy ingredient. Mayonnaise typically contains milk solids or whey in some formulations. Confirm the specific mayo recipe with the restaurant.
- EggContains
Mayonnaise is egg-based. The Double Bacon King includes mayonnaise as a standard topping. Removing the mayo removes the egg ingredient, though cross-contact on the bun or patty from shared prep surfaces remains possible.
- Wheat / GlutenContains
The sesame seed bun is wheat-based. This applies to all Burger King sandwich buns. There is no standard gluten-free bun option at Burger King. The bun is the primary wheat source for this sandwich.
- SoyMay contain
Refined soybean oil is used in Burger King kitchens for frying and preparation. The bun may also contain soy flour or soy lecithin. Highly refined soy oil is FDA-exempt from allergen labeling and tolerated by most with soy allergy. Those with severe soy sensitivity should confirm the specific oil and bun ingredients used.
- PeanutFree
Peanut is not an ingredient in the Double Bacon King or in standard Burger King burger preparation. Cross-contact is very unlikely in a burger-focused kitchen environment.
- Tree NutFree
Tree nuts are not an ingredient in the beef patties, bacon, cheese, bun, or standard condiments. Not a concern for this menu item.
- FishFree
Fish is not an ingredient in the Double Bacon King. Burger King's fish sandwich (Big Fish) is prepared separately, but shared grills or fryers for fish items could introduce trace fish protein — ask the restaurant about their fish preparation practices.
- ShellfishFree
Shellfish is not an ingredient in this burger and is not typical in Burger King kitchen environments.
- SesameMay contain
The standard sesame seed bun used for the Double Bacon King typically contains sesame seeds on top. Some locations may use a plain bun without sesame seeds. Confirm with your specific Burger King whether their bun is seeded. Sesame is also a potential ingredient in some specialty sauces or buns.
“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 double bacon 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 and mayonnaise
Request a lettuce wrap or no bun
Ask for a plain bun without sesame seeds
Confirm the mayonnaise recipe with the restaurant
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, including the Big Fish sandwich. Trace fish protein from the grill surface can transfer to beef patties. The bun toaster and prep surfaces are shared across all sandwich types. Cross-contact with wheat, milk, egg, and soy is possible from shared equipment and utensils. Ask staff about dedicated prep surfaces at your specific location.
If your allergy is severe
For anaphylactic allergy to wheat, milk, egg, or sesame, the Double Bacon King is not guaranteed safe without restaurant-level confirmation. The bun, cheese, and mayo are direct sources of these allergens. Shared grills and prep surfaces introduce cross-contact risk. Carry your epinephrine auto-injector. If you cannot confirm preparation details, consider a grilled chicken salad or other allergen-safe alternative from the menu.
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.
❓Frequently Asked Questions
Yes. The American cheese slices are a direct dairy ingredient. The mayonnaise also typically contains milk solids or whey. Removing both the cheese and mayo removes the direct dairy sources, though cross-contact from shared prep surfaces remains possible. If you have a dairy allergy, ask the restaurant whether their mayonnaise contains milk and whether they can prepare your burger without cheese on a clean surface.
No. The sesame seed bun is wheat-based, making the standard sandwich a direct source of gluten. Burger King does not offer a gluten-free bun option. A lettuce wrap or bunless preparation removes the wheat, but cross-contact from shared grills and toasters can reintroduce gluten. For celiac disease or severe wheat allergy, a bunless burger prepared on a clean surface is the safest option, but confirm with the restaurant.
Yes, through the mayonnaise. Mayonnaise is egg-based as a standard ingredient. Removing the mayonnaise removes the egg source. The beef patties and bacon do not contain egg. If you have an egg allergy, order the sandwich without mayo and confirm that no egg-based sauces or marinades are used on the patties.
It depends on the bun. The standard sesame seed bun used at Burger King typically has sesame seeds on top. Some locations may use a plain bun without seeds. Ask your specific Burger King whether their bun is seeded. If it is, request a plain bun or a lettuce wrap. Sesame is also a potential ingredient in some specialty sauces, so check any additional toppings.
Both are beef patty sandwiches on sesame seed buns with similar bun-related allergens (wheat, sesame). The key differences: the Double Bacon King adds bacon and American cheese (milk), while the Whopper includes tomato, lettuce, and mayonnaise (egg). The Double Bacon King has two patties versus the Whopper's one. The cheese in the Double Bacon King adds a direct milk source that the Whopper (without cheese) does not have. Both share the same cross-contact risks from shared grills and prep surfaces.
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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.