Saccharomyces boulardii

Saccharomyces boulardii is a probiotic yeast rather than a bacterial probiotic. People mainly use it for selected diarrhea contexts and gut-support claims.

View evidence-matched option on Amazon Amazon Associate disclosure: we earn from qualifying purchases.

Saccharomyces boulardii has useful evidence for selected diarrhea contexts, especially antibiotic-associated diarrhea, but probiotic effects are strain- and situation-specific.

Strong for specific diarrhea contexts Potential health risk health 6 linked sources Content audit 2026-05-16

Headline Finding

Cochrane pediatric AAD review: Lactobacillus rhamnosus or S. boulardii at 5-40 billion CFU/day appeared most appropriate among studied probiotics.

Dose Context

Trials commonly use specific S. boulardii preparations during antibiotic courses or acute diarrhea episodes; ordinary yeast products are not equivalent.

Important Caveat

Avoid in severe immunocompromise, central lines, critical illness, or high-risk hospital contexts unless a clinician specifically recommends it.

Source Drawer

Linked Research

6 papers and evidence links - audit 2026-05-16

Review Cochrane pediatric AAD
Meta-analysis AAD meta-analysis PubMed
Review Acute diarrhea review
Review Acute gastroenteritis update
Review C. difficile prevention review
Meta-analysis C. difficile meta-analysis

Product recommendation

Evidence-Matched Product Links

Affiliate disclosure: As an Amazon Associate I earn from qualifying purchases.

These links are only shown when we believe the product is genuinely useful for the stated claim and matches the evidence use case. Check the current Amazon label for dose, form, allergens, third-party testing, and seller details before buying. A product being available commercially does not change the evidence rating.

Saccharomyces boulardii option on Amazon
The evidence is strongest for specific diarrhea contexts; check the current label for S. boulardii strain/preparation, CFU count, and storage requirements.
Checked 2026-05-05 - Amazon
View on Amazon

How To Read This Rating

The score reflects evidence that the supplement does its stated job. Some jobs are direct, such as strength, endurance, or recovery; others are indirect, such as sleep, mood, appetite, or health support. A real effect can still receive a cautious practical rating when dose, safety, product quality, or audience fit remain uncertain.

Spot An Evidence Issue?

Send the disputed claim, source link, and why it changes the practical verdict. Corrections that materially affect the claim, dose, caveat, or rating are prioritized.

Report a source or rating issue