Saccharomyces cerevisiae — answers to baker's/brewer's yeast
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A species of yeast used widely in baking, brewing, and as a source of nutrients or live cultures in some supplements. It is a different species from the more studied probiotic strain Saccharomyces boulardii.
Why it’s used
Taken by some as a source of B vitamins, protein, or as a general probiotic, though claims vary by product.
What the evidence says
There is no NIH Office of Dietary Supplements fact sheet specific to this species, and clinical research on plain Saccharomyces cerevisiae (as distinct from S. boulardii) for digestive or immune effects is limited and inconsistent.
Where we looked
There was no paper to cite here, so this is the search instead — run it yourself and see what we saw.
- PubMed: 35 records · searched August 2026
"Saccharomyces cerevisiae"[Title/Abstract] AND ("dietary supplements"[MeSH] OR supplementation[Title/Abstract] OR supplement[Title/Abstract] OR supplements[Title/Abstract] OR "oral administration"[Title/Abstract]) AND (randomized controlled trial[pt] OR clinical trial[pt] OR meta-analysis[pt] OR systematic review[pt]) AND humans[MeSH] - PubMed: 81276 records · searched August 2026
"Saccharomyces cerevisiae"[Title/Abstract]
This says what this database holds under these terms. It is not a finding that no research exists.
Context
Much of the probiotic literature that gets attributed loosely to "yeast" supplements actually concerns the distinct strain S. boulardii, which complicates comparison.
Educational information, not medical or safety advice. Consult a professional for allergies or medical concerns.