What this guide covers: Seed oil usage in In-N-Out's menu items, based on their published ingredient documentation. This guide does not evaluate overall nutrition, calories, or other health factors.
In-N-Out is celebrated for its fresh, never-frozen beef and minimal ingredient list. From a seed oil standpoint, however, their frying fat is sunflower oil — one of the highest omega-6 oils used in any major chain. The beef patty itself is clean. The fries and bun are not.
What oil In-N-Out uses
In-N-Out uses sunflower oil for their fries. Sunflower oil is extracted from sunflower seeds and is approximately 65% linoleic acid (omega-6) per USDA FoodData Central data. This is higher than soybean oil (54%) and significantly higher than canola oil (21%). From a seed oil perspective, sunflower oil is one of the more concentrated sources of omega-6 polyunsaturated fat.
In-N-Out's ingredient documentation is published on their website. Their approach to food quality — fresh beef, fresh potatoes, no preservatives — is genuinely impressive by fast food standards. The sunflower oil is a specific limitation for diners focused on seed oil reduction.
No seed oil in the ingredient list
- ✓Beef patty Fresh ground beef, never frozen. No added oil in the patty itself per published documentation.
- ✓American cheese Processed cheese with no seed oil listed as primary ingredient.
- ✓Lettuce, tomato, onion No oil. Fresh produce.
- ✓Whole grilled onions Cooked on the griddle in beef fat, not seed oil.
Contains seed oil
- ✗French fries Cooked in sunflower oil (~65% omega-6 linoleic acid).
- ✗Bun Soybean oil listed as an ingredient.
- ✗Spread (house sauce) Mayonnaise base contains soybean oil.
- ✗Ketchup Contains high fructose corn syrup and seed oil derivatives.
Our Pick
Fatworks Pasture-Raised Beef Tallow
For frying at home without sunflower oil. Tallow is what McDonald's used before 1990 — stable at high heat, rich flavor, and none of the omega-6 load of sunflower oil.
Frequently asked questions
Does In-N-Out use seed oils?
Yes. In-N-Out Burger uses sunflower oil for frying their fries. Sunflower oil is a seed oil — it is extracted from sunflower seeds using industrial processing and is very high in omega-6 linoleic acid, at approximately 65% per USDA FoodData Central data. This is higher than canola oil (21%) or even soybean oil (54%).
What oil does In-N-Out fry in?
In-N-Out uses sunflower oil in their fryers. This is documented in their published ingredient and allergen information. Sunflower oil is one of the highest omega-6 oils available and is significantly higher in linoleic acid than canola oil.
Does the In-N-Out burger patty have seed oil?
The In-N-Out beef patty contains fresh beef with no added oil, per their published ingredient information. They also famously do not use preservatives or frozen ingredients. However, the bun and most sauces (Spread, ketchup) contain seed oils.
Is In-N-Out's sunflower oil worse than McDonald's canola oil?
From a seed oil standpoint, yes — sunflower oil is higher in omega-6 linoleic acid (approximately 65%) than canola oil (approximately 21%). However, In-N-Out uses fresh, never-frozen beef with no added preservatives, and their overall ingredient quality is higher than most fast food chains. The oil is the main concern.
What can I order at In-N-Out without seed oil?
The beef patty itself contains no added seed oil per their ingredient documentation. A protein-style burger (wrapped in lettuce instead of a bun) with no sauce eliminates the bun's seed oils and the spread's seed oils. You cannot fully avoid seed oil at In-N-Out since the fries share the fryer with the sunflower oil.
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