Nutritional yeast is a deactivated yeast, often a strain of Saccharomyces cerevisiae, which is sold commercially as a food product. It is sold in the form of yellow flakes, granules or powder and can be found in the bulk aisle of most natural food stores. It is popular with vegans...
Nutritional yeast has a strong flavor that is described as nutty or cheesy, which makes it popular as an ingredient in cheese substitutes. It is often used by vegans in place of cheese; for example, in mashed and fried potatoes, in scrambled tofu, or as a topping for popcorn.