Nutritional yeast is deactivated Saccharomyces cerevisiae sold as yellow flakes or powder. Its savory, cheesy taste makes it a useful dairy alternative and seasoning.
It supplies a complete protein and many B vitamins. Fortified versions add vitamin B12. People shake it onto popcorn, pasta, and salads or blend it into sauces and vegan cheese recipes for extra nutrients.
The yeast is high in purines and niacin. Anyone with gout, known migraine triggers, or sensitivity to B vitamins should use caution.