The yeast in supplements is typically inactive (autolyzed) and sold as nutritional yeast or brewer's yeast. Unlike live *Saccharomyces boulardii*, this heat-killed form is not a probiotic. It supplies B vitamins (including B12 if fortified), protein, and minerals.
Many people add it to popcorn, pasta, salads, smoothies, or soups to increase the B vitamin and protein content of a meal. Vegetarians and vegans reach for it as a plant-based B vitamin source.
There is no strong evidence that it provides any specific health benefits. It should not take the place of a balanced