Nutritional Yeast

Nutritional yeast is a deactivated yeast — Saccharomyces cerevisiae — that’s grown, harvested, dried, and sold as flakes or powder. It’s a complete protein, a reliable source of B vitamins including B12 in fortified versions, and it has a savory, cheesy, umami flavor that makes it one of the more functionally useful ingredients in plant-based cooking. It’s not a protein source in the same sense as tofu or tempeh — the amounts used in cooking are typically too small to contribute meaningfully to daily protein targets — but as a flavoring ingredient that happens to be nutritionally dense, it earns a genuine place in the pantry.

The flavor is the primary reason to use it. Nutritional yeast tastes like a mild, nutty parmesan — savory and rich in a way that’s difficult to replicate with other plant-based ingredients. It adds depth to sauces, soups, and dressings, works as a cheese substitute in pasta and grain dishes, and can be used as a seasoning sprinkled directly over food the way parmesan would be. For people cooking plant-based meals who find the lack of savory depth a challenge, nutritional yeast addresses that gap directly.

The B12 content is the nutritional detail most worth paying attention to, with a caveat. Many but not all nutritional yeast products are fortified with B12 — the label specifies whether it’s present. For plant-based eaters supplementing B12 through diet rather than dedicated supplements, fortified nutritional yeast used regularly can contribute meaningfully to B12 intake. It’s not a substitute for a dedicated B12 supplement given the variability in how much is used day to day, but it’s a useful contribution alongside other fortified foods.

Reference Card

Pillar: Nourish Category: Proteins → Plant Proteins → Complete Plant Proteins

Nutritional profile (per 15g / 2 tablespoons, fortified)

Calories — approximately 45
Protein — approximately 8g
Fat — approximately 0.5g
Carbohydrates — approximately 5g
Notable micronutrients — B12 (in fortified versions), B1, B2, B3, B6, folate, zinc, selenium

How to use it

Stir into pasta sauces — adds savory depth and a parmesan-like quality
Sprinkle over popcorn with olive oil and salt — a classic preparation that showcases the flavor
Add to soups and stews — contributes umami and body
Use in cashew-based cheese sauces — the standard plant-based cheese sauce base
Sprinkle over grain bowls and salads — works as a finishing seasoning
Stir into scrambled eggs or tofu scrambles — adds savory depth

Considerations

Check the label for B12 fortification — not all nutritional yeast products contain it
The amounts used in cooking are typically too small to meet full daily protein needs — a flavoring ingredient that contributes protein rather than a primary protein source
Store in a cool, dry place away from light — degrades with heat and light exposure
Fortified nutritional yeast contributes to B12 intake for plant-based eaters but is not a substitute for a dedicated B12 supplement

Common myths

Nutritional yeast is the same as brewer’s yeast or baking yeast — they are all derived from Saccharomyces cerevisiae but are processed differently and are not interchangeable; nutritional yeast is specifically deactivated and dried for use as a food product
Nutritional yeast provides enough B12 for plant-based eaters without supplementation — the amount consumed day to day varies too much to rely on it as a sole B12 source; a dedicated supplement remains necessary on a fully plant-based diet