Not vegan

cow mozzarella is classified as animal-derived by the local ingredient taxonomy.

Names you may see on a label

ser mozzarella z mleka krowiegomozzarella de vachemozzarella di vaccacow milk mozzarellamozzarella au lait de vache

How to verify it

If this ingredient appears in the recipe rather than a precautionary trace statement, the product is not vegan.