Pizza dough is usually made with just a few simple ingredients, such as water, flour, yeast, and oil that are animal-free; usually homemade pizza dough. However, some recipes call for the use of eggs. Store-bought pizza dough may include non-vegan-friendly ingredients. It is important to check out the labels and watch out for ingredients such as the following; Sugar, may include animal bone char in the processing. Milk products such as whey protein Additives such as emulsifiers, regulators, and preservatives which may be animal derived.