Subtotal $0.00
Shop Now
Nutritional yeast is a deactivated form of Saccharomyces cerevisiae, the same yeast species used in baking and brewing, that is grown, heated so it can no longer ferment, then dried into yellow flakes or powder. People sprinkle it on popcorn, pasta and vegetables for its savory, cheese-like taste. Its nutrition depends heavily on one word on the package: fortified. Fortified products have B vitamins, often including vitamin B12, added during manufacturing; unfortified products do not, so they are not a dependable B12 source. Below is what nutritional yeast is, how to read the label, what USDA data can and cannot tell you, and who should check with a clinician first.
Peptide Labs does not sell nutritional yeast. This article is general nutrition information, not medical advice.
Key Takeaways
- Nutritional yeast is deactivated Saccharomyces cerevisiae sold as flakes or powder for flavor.
- Fortified and unfortified versions differ sharply in B vitamins, so the Nutrition Facts panel matters.
- NIH lists fortified nutritional yeast as a B12 source, but the amount varies widely by brand.
- USDA SR Legacy has no nutritional yeast entry; related yeast foods show how variable yeast products are.
- People with yeast sensitivity or who take certain medicines should ask a clinician before using it often.
What is nutritional yeast?
According to Cleveland Clinic, nutritional yeast is made by growing Saccharomyces cerevisiae with molasses and oxygen, then heating it so the yeast is inactive. That heating step is the key difference from the active dry yeast in a baking aisle packet, which is sold alive so it can make dough rise. Nutritional yeast will not leaven bread, and it is sold as a seasoning rather than an ingredient that does chemical work in a recipe.
It is also different from two other yeast products with similar names. Brewer’s yeast is usually a by-product of beer making and tends to taste more bitter. Yeast extract spreads are concentrated, salty pastes made from yeast. And red yeast rice is something else entirely: rice fermented with a mold, sold as a supplement, which we cover in our red yeast rice guide.
Nutritional yeast nutrition: what USDA data can tell you
Our food articles normally lead with a USDA FoodData Central table. Here that is not possible in a straightforward way: the USDA SR Legacy database, which we use for consistent values, does not contain a nutritional yeast entry. Brand data varies too much to stand in for it, because fortification levels are a manufacturer’s choice. What SR Legacy does contain are two related yeast foods, shown below with their FDC IDs. They are not nutritional yeast, but they show how rich yeast products can be in some B vitamins and how little B12 yeast carries unless it is added.
| Nutrient | Baker's yeast, active dry (FDC 175043), 1 tbsp (12 g) | Yeast extract spread (FDC 167717), 1 tsp (6 g) |
|---|---|---|
| Calories | 39 | 11 |
| Protein | 4.9 g (10% DV) | 1.4 g (3% DV) |
| Fiber | 3.2 g (12% DV) | 0.4 g (1% DV) |
| Thiamin (B1) | 1.32 milligrams (110% DV) | 1.4 milligrams (117% DV) |
| Riboflavin (B2) | 0.48 milligrams (37% DV) | 1.05 milligrams (81% DV) |
| Niacin (B3) | 4.8 milligrams (30% DV) | 7.65 milligrams (48% DV) |
| Folate | 281 micrograms DFE (70% DV) | 353 micrograms DFE (88% DV) |
| Vitamin B12 | Less than 1% DV | 1% DV |
| Sodium | 6 milligrams (0% DV) | 203 milligrams (9% DV) |
Percent Daily Value (%DV) uses the FDA Daily Values printed on Nutrition Facts labels. Two lessons carry over to nutritional yeast. First, yeast foods can be dense in thiamin, riboflavin, niacin and folate, partly from the yeast itself and partly from fortification, depending on the product. Second, neither entry supplies meaningful vitamin B12. That is why the B12 in nutritional yeast should be seen as a feature of a specific fortified product, not of yeast in general.
Fortified vs unfortified nutritional yeast
Cleveland Clinic describes fortified nutritional yeast as containing its naturally occurring nutrients plus added ones, while unfortified types have nothing added. On a package, fortification usually shows up in two places: the ingredient list names the added vitamins, such as thiamin hydrochloride, riboflavin, niacin, pyridoxine hydrochloride, folic acid and cyanocobalamin (a form of B12), and the Nutrition Facts panel shows large %DV numbers for those vitamins.
- Fortified: added B vitamins; B12 is often, but not always, among them.
- Unfortified: only what the yeast naturally contains, which does not include a reliable amount of B12.
- Serving size: brands list different serving sizes, from a teaspoon to a quarter cup, so compare %DV per the same amount.
- Folic acid: some fortified flakes add folic acid; if you already use a multivitamin or prenatal, ask a clinician whether the total matters for you.
- Gluten and allergens: look for a gluten-free label if you need one and read the allergen statement for shared-facility notes.
Does nutritional yeast contain B12?
The NIH Office of Dietary Supplements (ODS) B12 fact sheet says vitamin B12 is not naturally present in plant foods and names fortified breakfast cereals and fortified nutritional yeasts as readily available sources with high bioavailability. ODS lists fortified nutritional yeast from several brands at about 8.3 to 24 micrograms per quarter cup and tells readers to check the label, a threefold spread between products. Cleveland Clinic notes that a tablespoon of some fortified products can exceed the full Daily Value several times over.
The practical takeaway is simple: nutritional yeast is not a dependable B12 source on its own. A brand can change its formula, and unfortified flakes may contain little or none. FDA rules do not require B12 to be listed unless it has been added, so if B12 is missing from the panel, do not assume it is there. People who eat few or no animal foods can read more in our guides to foods with vitamin B12 and vitamin B12 supplements, and anyone concerned about low B12 should talk with a clinician about testing rather than relying on a seasoning.
Nutritional yeast benefits: what is realistic
Most of the realistic nutritional yeast benefits are culinary and nutritional rather than medical. It adds savory, umami flavor, which lets some cooks use less cheese or salt in sauces and toppings. It contributes protein and fiber in small amounts, and fortified versions add B vitamins. For people following vegan or dairy-free diets, it is one of several ways to add flavor and fortified nutrients. Claims that nutritional yeast boosts immunity, energy or weight loss go beyond what has been shown for the food as people actually eat it.
If you are building a plant-forward plate, protein from nutritional yeast is modest compared with beans, soy foods and seeds, which we list in our protein foods guide. Seeds such as hemp hearts add more protein and minerals per spoonful, while nutritional yeast mainly brings flavor and fortified vitamins.
Who should be careful
Nutritional yeast is a common food, but a few groups should check with a clinician before using it often. Cleveland Clinic flags people with a yeast intolerance or sensitivity, and people taking certain medicines, because yeast products can contain tyramine, a compound that interacts with some antidepressants known as MAO inhibitors. Anyone who notices hives, swelling or digestive upset after eating it should stop and get medical advice. If you take several fortified foods and supplements, bring the labels to your pharmacist or clinician so they can see the combined vitamin totals.
How to use and store it
- Sprinkle flakes on popcorn, roasted vegetables, pasta or salads.
- Whisk into sauces, soups or scrambled eggs and tofu for a savory note.
- Store in a cool, dry, sealed container away from light, and follow the package date.
- Compare labels by %DV per the same serving size rather than by the front-of-pack claims.
Frequently Asked Questions
What is nutritional yeast made of?
It is Saccharomyces cerevisiae yeast that has been grown, heated so it is inactive, and dried into flakes or powder. Fortified versions also contain added vitamins.
Does nutritional yeast have B12?
Only if it is fortified with it. NIH lists fortified products from several brands at widely different amounts, so check the Nutrition Facts panel.
Is nutritional yeast the same as brewer’s or baker’s yeast?
No. Baker’s yeast is sold alive to raise dough, and brewer’s yeast is usually a beer by-product. Nutritional yeast is deactivated and sold as a seasoning.
Why does nutritional yeast taste like cheese?
It has a savory, umami flavor that many people compare to cheese or nuts, which is why it is popular in dairy-free cooking.
Is there a USDA entry for nutritional yeast?
Not in the SR Legacy database used here. Values differ by brand and fortification, so the package label is the reliable source.
Who should avoid nutritional yeast?
People with a yeast sensitivity and people taking MAO inhibitor antidepressants should ask a clinician first. Stop eating it if you notice an allergic reaction.
Questions about a label? Contact us or read our Buyer’s Guide. Food comes first; follow the label and ask a healthcare provider before starting a supplement, especially if you take medicines, are pregnant or have a food allergy. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
Last reviewed October 2026.
Related guides: B12 Foods: Animal, Fortified and Vegan Sources Ranked, Hemp Hearts: USDA Nutrition, Protein, Minerals and THC Facts, High Protein Foods: USDA Values for Meat, Dairy and Plant Sources.