Fortified nutritional yeast is enriched with additional vitamins and minerals, including B12, folic acid, and zinc. Unfortified nutritional yeast does not have these added nutrients but still contains natural vitamins and minerals from the fermentation process. The choice between fortified and unfortified nutritional yeast depends on personal preference and dietary needs. Fortified yeast is recommended for those following a vegan diet who may have limited sources of B12. It’s important to read the labels and choose a nutritional yeast brand that aligns with your nutritional goals.