Why It's Confusing
The word "pizza" covers very different products. Certified Neapolitan pizza is regulated: the dough must contain only flour, water, sea salt, and yeast [[2]](#source-2). American, British, and delivery-chain recipes are not bound by that specification, and each chain formulates dough to hit a specific texture, colour, and shelf life.
The common additions are milk powder for browning, butter or oil-and-butter blends for softness, egg for enriched doughs such as pan and deep-dish, honey or sugar for crust colour, and L-cysteine (E920) as a dough conditioner. See L-cysteine for why that ingredient is a separate risk even when the dough looks clean. Stuffed and cheese-crust variants contain dairy in the crust itself.
Where It Commonly Appears
- Chain pizza (Domino's [[3]](#source-3), Pizza Hut [[4]](#source-4), Papa John's) with varying formulas by country and dough type
- Deep-dish, pan, and Chicago-style pizza, which more often contain butter or milk
- Frozen supermarket pizza bases
- Stuffed crust, cheese crust, and garlic butter crust products, which always contain dairy
- Hotel and airport pizza counters
What To Watch For
- Milk, milk powder, butter, egg, or honey in the dough ingredient list
- "Contains milk" or "contains egg" on the allergen line
- L-cysteine or E920 as a dough improver
- Garlic butter, cheese, or milk-based glazes brushed onto the crust before baking
- Chain allergen guides listing dough types separately, since classic and thin doughs are often vegan while pan and stuffed doughs are not [[3]](#source-3)[[4]](#source-4)
Vegan Alternatives
- Neapolitan-style pizzerias that follow the four-ingredient dough rule [[2]](#source-2)
- Chain classic or thin-crust bases confirmed vegan in the local allergen guide
- Vegan-certified frozen pizza bases
- Home-made dough with flour, water, salt, yeast, and olive oil