Key findings
- 1Nutritional yeast is industrially produced through fermentation, heat-killing, and drying
- 2In our analysis, nutritional yeast products average a Processing Score of 2.3, which is Level 1
- 3The umami flavor comes from naturally occurring glutamic acid in yeast, not from added MSG or flavorings
- 4Fortified nutritional yeast is a common B12 source for plant-based diets, the fortification does not significantly change the processing level
Why is Nutritional Yeast Level 1 on average?
Nutritional yeast (Saccharomyces cerevisiae) is grown in large fermentation vats on a molasses medium for several days. The yeast is then harvested, washed, and heat-killed (pasteurized), which distinguishes it from active baking yeast. The dead yeast cells are then roller-dried and crumbled into flakes or powder. Many brands fortify with synthetic B vitamins, including cyanocobalamin (B12), during or after drying. The entire process is industrial in scale but uses no chemical solvents, artificial flavors, or preservatives. The naturally occurring glutamic acid in the yeast cells is what gives nutritional yeast its savory, cheese-like umami flavor.
How 51 nutritional yeast products break down
Share of products at each processing level, in our analysis.
Nutritional Yeast brand comparison
From least to most processed in our database.
How to read a nutritional yeast label
- 1
Unfortified nutritional yeast lists one ingredient: dried yeast (Saccharomyces cerevisiae)
- 2
Fortified versions add synthetic B vitamins; check if fortification matters to you
- 3
The cheesy flavor is from natural glutamic acid in yeast cells, not added flavoring
- 4
Watch for brands with added salt, sugar, or artificial flavors; these are unnecessary additions
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Frequently asked questions
Is nutritional yeast the same as brewer's yeast?
Both are Saccharomyces cerevisiae, but nutritional yeast is grown specifically as a food product on molasses, while brewer's yeast is a byproduct of beer brewing. The processing is similar (both are heat-killed and dried) but the growing conditions and flavor differ.
Does nutritional yeast contain MSG?
Nutritional yeast contains naturally occurring glutamic acid (the same compound in MSG) produced by the yeast cells during growth. It does not contain added manufactured MSG. The savory flavor is a natural property of the yeast.
Is nutritional yeast a whole food?
Nutritional yeast is a single-celled organism that has been grown, killed, and dried. It is more processed than raw vegetables or grains but contains no artificial additives. It occupies a middle ground between whole foods and industrial ingredients.