Bacon King: Allergens at a Glance
The honest verdict
Bacon King · Burger King
The Bacon King is a double cheeseburger topped with bacon, served on a sesame seed bun. It contains wheat from the bun, milk from the American cheese, egg from the mayonnaise, and soy from the refined soybean oil used in the mayo and for frying. Sesame is present on the bun. Peanut, tree nut, fish, and shellfish are not typical ingredients. Cross-contact on shared grills and fryers is possible. This sandwich is distinct from the Whopper (which includes tomato, lettuce, onion, pickles, and ketchup) and the Bacon Double Cheeseburger (which uses a different bun and sauce). 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 Bacon King is a double cheeseburger with bacon, distinct from the Whopper which adds tomato, lettuce, onion, pickles, and ketchup.
Burger King's sesame seed bun is the primary source of wheat and sesame in the Bacon King.
Shared grills and fryers at Burger King create cross-contact risk for milk, wheat, and soy even with modifications.
Every major allergen, one clear grid
Each of the nine major allergens marked for 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 is a standard topping on the Bacon King. Milk is a primary ingredient in the cheese. Some locations may offer a dairy-free modification by removing the cheese, but the sandwich is typically served with cheese as standard.
- EggContains
Mayonnaise is a standard condiment on the Bacon King. Eggs are a primary ingredient in mayonnaise. Removing the mayo removes the egg source, but confirm the bun and other toppings do not contain egg.
- Wheat / GlutenContains
The Bacon King is served on a sesame seed bun made from wheat flour. There is no standard gluten-free bun option at Burger King. The bun is the primary wheat source.
- SoyContains
Refined soybean oil is used in the mayonnaise and for frying the bacon and beef patties. Highly refined soy oil is FDA-exempt from allergen labeling and tolerated by most with soy allergy, but those with severe soy sensitivity should confirm the oil type used.
- PeanutFree
Peanut is not an ingredient in the Bacon King or its components. Burger King does not use peanut oil in standard fryers. Cross-contact is very unlikely.
- Tree NutFree
Tree nuts are not an ingredient in the Bacon King or its components. No tree nut oils or toppings are used.
- FishFree
Fish is not an ingredient in the Bacon King. Burger King does not typically fry fish items in the same fryers used for bacon or beef patties, but cross-contact is possible if the restaurant serves the BK Fish Sandwich in shared fryers.
- ShellfishFree
Shellfish is not an ingredient in the Bacon King and is not typical in Burger King kitchens.
- SesameContains
The sesame seed bun is a standard component of the Bacon King. Sesame seeds are applied to the top of the bun. Removing the bun removes the sesame source, but the sandwich is typically served with the seeded bun.
“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 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 the Bacon King without cheese
Order the Bacon King without mayonnaise
Request the sandwich without the bun (lettuce wrap or bowl)
Ask for a fresh batch of bacon cooked in a dedicated fryer
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 grills and fryers are shared across menu items. The beef patties and bacon are cooked on the same flat-top grill used for other sandwiches, including those with cheese and buns. Fryers used for bacon may also be used for chicken items, hash browns, and other breaded products. Cross-contact with wheat, milk, and soy is possible even with modifications. Ask your specific location about their cooking practices.
If your allergy is severe
For anaphylactic allergy to milk, wheat, egg, or soy, the Bacon King is not a safe choice without restaurant-level confirmation. Shared grills, fryers, and prep surfaces create real cross-contact risk. Carry your epinephrine auto-injector. If you cannot confirm preparation details, consider a simpler menu item like a plain beef patty without bun or toppings.
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 Bacon King contains dairy from the American cheese. Milk is a primary ingredient in the cheese. Removing the cheese removes the dairy source, but confirm the bun and other toppings do not contain dairy. Burger King's sesame seed bun is typically dairy-free, but cross-contact on shared grills is possible.
No, the Bacon King contains wheat from the sesame seed bun. There is no standard gluten-free bun option at Burger King. Removing the bun and ordering the sandwich as a lettuce wrap or bowl removes the wheat source, but cross-contact on shared grills with breaded items is possible.
Both sandwiches contain wheat (bun), milk (cheese), egg (mayo), soy (mayo oil), and sesame (seeded bun). The Bacon King adds bacon (cooked in shared fryers) and uses a different sauce profile — the Whopper includes ketchup, tomato, lettuce, onion, and pickles, which are typically allergen-free. The Bacon King's bacon introduces an additional cross-contact risk via fryer oil. The core allergen profile is very similar, but the bacon adds a variable.
Yes, the Bacon King contains soy via refined soybean oil used in the mayonnaise and for frying the bacon and beef patties. Highly refined soy oil is FDA-exempt from allergen labeling and tolerated by most with soy allergy, but those with severe soy sensitivity should confirm the oil type used. Removing the mayonnaise reduces but does not eliminate soy exposure.
The sesame source is the seeded bun. Removing the bun removes the sesame. You can order the sandwich as a lettuce wrap or bowl without the bun. Confirm with the restaurant that no other components (sauce, toppings) contain sesame. Burger King's standard mayonnaise and cheese do not contain sesame.
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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.