Nutritional yeast is a complete protein. This means that among the 18 amino acids it contains, nine are essential ones that your body cannot produce.  Nutritional yeast is a plant based source of protein, making it the perfect staple in a vegan’s kitchen. Nutritional yeast is gluten-free and low in fat and sodium. Nutritional yeast is a great source for B12 vitamins. If you’re vegan you should add this to your food on a regular basis.