Nutritional yeast is made from an inactive yeast- it has a nutty, cheesy flavour that makes it an amazing vegan option. It's also a great way to add more B12 and protein to your diet. Parmesan is a dairy product, so not vegan-friendly. However, parmesan is a lactose-free cheese, making it great for anyone with lactose intolerance! I personally like doing half parmesan cheese and nutritional yeast.