McDonald's fries illustration
National chain · Est. 1940

McDonald's

World Famous Fries® — and the famous ingredient surprise.

Last verified April 18, 2026 U.S. recipe Varies by country
§ 01

At a glance

Vegetarian
Not suitable
"Natural beef flavor" is derived from beef.
Vegan
Not suitable
Beef flavor + milk derivatives.
Gluten-Free
Not suitable
Hydrolyzed wheat in beef flavor; shared fryer risk.
Dairy-Free
Not suitable
Hydrolyzed milk in beef flavor.
Kosher
Not certified
Contains beef-derived flavoring; not kosher-certified.
Halal
Not certified
Beef source not halal-certified in U.S.
If you're reading ingredient labels for ethical or medical reasons, McDonald's U.S. fries do not clear the bar for vegetarian, vegan, gluten-free, or dairy-free diets. The obstacle in every case is the same: a flavoring added to the frying oil that is derived from beef and contains hydrolyzed wheat and milk as starting ingredients.
§ 02

Ingredients, line by line

Annotated ingredient list — U.S.

  • Potatoes Fine — Russet Burbank and Shepody varieties, per McDonald's.
  • Vegetable oil Soy — Blend of canola, corn, soybean, and hydrogenated soybean oil.
  • Natural beef flavor Non-veg · Gluten · Dairy — Derived from beef. Starting ingredients include hydrolyzed wheat and hydrolyzed milk.
  • Dextrose Fine — A sugar, added to maintain consistent color during frying.
  • Sodium acid pyrophosphate Fine — Preservative; prevents graying of potato after cutting.
  • Salt Fine
  • TBHQ, citric acid, dimethylpolysiloxane Additives — Added to the cooking oil: TBHQ (preservative), citric acid (processing aid), dimethylpolysiloxane (anti-foaming, reduces splatter).
Potatoes, Vegetable Oil (Canola Oil, Corn Oil, Soybean Oil, Hydrogenated Soybean Oil, Natural Beef Flavor [Wheat and Milk Derivatives]*), Dextrose, Sodium Acid Pyrophosphate (Maintain Color), Salt.
*Natural Beef Flavor contains Hydrolyzed Wheat and Hydrolyzed Milk as starting ingredients.
What's "natural beef flavor"? Before 1990, McDonald's fried its U.S. fries in beef tallow (beef fat). When the company switched to vegetable oil, it kept the flavor signature by adding a beef-derived flavoring to the oil. A 2002 class-action lawsuit — settled by McDonald's for $10 million — brought this publicly to light after years of vegetarian customers assuming otherwise.
§ 03

Oil & fryer setup

Primary oil
Vegetable oil blend
Canola, corn, soybean, and hydrogenated soybean oil. Plus natural beef flavor, TBHQ, citric acid, and dimethylpolysiloxane.
Fryer setup
Shared (varies)
Policies vary by franchise location. Hash browns share the fryer; in some locations so do Filet-O-Fish or breaded chicken items.
Cross-contamination
Yes, per McDonald's
"Normal kitchen operations may involve some shared cooking and preparation areas" — McDonald's official allergen notice.
Trans fat
0g per serving
Since the oil reformulation in the late 2000s, the hydrogenated soybean component contains non-hydrogenated equivalents; trans fat is 0g per labeled serving.
§ 04

Top-9 allergen status

Per the FDA's nine major allergens, as disclosed by McDonald's for U.S. World Famous Fries®.

✗ Milk
✗ Wheat
✓ Egg
✗ Soy
✓ Peanut
✓ Tree Nut
! Fish*
✓ Shellfish
✓ Sesame

*Fish: Filet-O-Fish shares fryers in some locations; ingredient-level the product does not contain fish. Considered a cross-contamination risk only.

§ 05

Why Canadian & European fries are different

The same product, under the same name, with a different ingredient list depending on which country you're in. McDonald's U.S. fries contain natural beef flavor and the wheat/milk derivatives that come with it. McDonald's in Canada, the UK, and many European countries do not use that same flavoring — their fries are commonly considered vegetarian-friendly at the ingredient level, though not certified vegan and still subject to local cross-contamination risks.

If you travel internationally, never assume the domestic ingredient list applies. Always check the country-specific allergen page. A fry that fails your diet in Virginia may clear it in Vancouver or London — and vice versa.

Documented variations per official McDonald's sites: Canada, the UK, and most of the EU use a different oil formulation that does not include beef-derived flavoring. Check McDonald's Canada for Canadian-specific ingredients.

§ 06

In the wild

We photograph every chain's fries in their real-world packaging, not in staged marketing shots.

Photo coming soon
§ 07

Sources

Every claim on this page is sourced. If a source is wrong, dated, or missing, tell us — we update quickly.

  1. 01
    McDonald's USA — Small World Famous Fries® product page Primary source · Accessed April 2026
  2. 02
    McDonald's USA — Nutrition & ingredients page Primary source · Includes official allergen notice
  3. 03
    McDonald's Canada — French Fries product page Comparative source · Canadian recipe
  4. 04
    NBC News — "McDonald's fries contain allergens" (2006) Historical record · Reports McDonald's disclosure of wheat and dairy derivatives + references 2002 $10M vegetarian lawsuit settlement
  5. 05
    Go Dairy Free — McDonald's dairy-free guide Secondary source · Notes milk in U.S. fries absent in other countries
Important — read before you eat Ingredient formulations change, sometimes with no public announcement. Allergen risk at any fast-food restaurant depends on the specific location, the time of day, and the staff on shift. For severe allergies, confirm ingredients with the restaurant at the point of ordering, and when in doubt, ask about fryer and equipment cross-contact. This page is an independent reference — not medical advice. Always consult a healthcare professional about your diet.
§ 08

Compare with other chains

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