Here's Exactly How Many Ingredients Go Into In-N-Out's Famous Fries - Tasting Table

"If you know anything about how fast food is made on a large scale, you'll be aware that the ingredients are never as straightforward as they might seem, even for something as simple as fries. And while nutritional and allergy information is required, the exact ingredients aren't always made available. It was it was only in mid-2025 that In-N-Out published a full list of ingredients, which might lead you to think they have something to hide."

"With the fries, there's really not much to it, with just six ingredients: potatoes, sunflower oil, dimethylpolysiloxane, and a seasoning made from salt, pepper, and canola oil. The ingredient that probably jumps out at you here is dimethylpolysiloxane. It's not added to the fries themselves, but to the cooking oil. It's a food-grade anti-foaming agent that helps to prevent splattering for the safety of staff."

In-N-Out fries are made from six ingredients: potatoes, sunflower oil, dimethylpolysiloxane, and a seasoning of salt, pepper, and canola oil. Dimethylpolysiloxane is added to the cooking oil as a food-grade anti-foaming agent to prevent splattering and protect staff safety. No preservatives are used because the fries are made from fresh-cut potatoes. Despite the fresh, simple recipe, In-N-Out fries receive mixed reviews, with an LA Times critic ranking them last and David Chang blaming out-of-season potatoes for lackluster flavor. Animal-style fries rely on toppings—grilled onions, cheese, and a 24-ingredient secret spread—rather than changes to the base fries.

Read at Tasting Table