It's a deactivated form of yeast. It’s typically made from the single-celled organism Saccharomyces cerevisiae, grown on molasses and then harvested, washed, and dried with heat. This “deactivates” the yeast, meaning it can’t grow or leaven baked goods.u003cbr/u003eu003cbr/u003eNutritional yeast is a great source of vitamins and minerals. It’s vegan and naturally gluten-free.u003cbr/u003e