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Saccharomyces boulardii

What does the research say about Saccharomyces boulardii?

3 health outcomes synthesised

Research on Saccharomyces boulardii covers 3 health outcomes related to diarrhea. The strongest evidence, based on 4 studies, supports its use for reducing diarrhea rate, with a typical dose of 500 mg twice daily studied in children with acute diarrhea and patients with small intestinal bacterial overgrowth (SIBO).

Strongest evidence Saccharomyces boulardii has moderate evidence for two outcomes: reducing diarrhea rate (4 studies) and reducing diarrhea duration (3 studies). For diarrhea rate, all 4 studies showed beneficial effects with small to moderate effect sizes; the effective dose was consistently 500 mg twice daily. For duration, a meta-analysis of 1,125 children reported a large effect (reduction of ~1.6 days), though dosing was not consistently reported across studies.

Mixed or weaker evidence A third outcome—general reduced diarrhea—has low evidence (3 studies, 1 beneficial, 2 neutral). Benefit was observed only in patients with SIBO associated with long-term PPI use, and the effect size was small. This suggests the benefit may not generalize to other populations.

Effective dose patterns Where reported, 500 mg twice daily appears across multiple studies, particularly for diarrhea rate and general diarrhea outcomes. This consistency strengthens confidence in this dosing range, though the duration of supplementation varied (15–35 days).

Population insights The evidence primarily comes from children aged 6 months to 5 years with acute diarrhea or gastroenteritis, and from adults with SIBO associated with long-term PPI use. Generalizability to other populations (e.g., adults without SIBO, elderly) is not established.

Notable caveats The evidence base is small (3–4 studies per outcome), making conclusions preliminary. Publication bias is a concern—null results are less likely to be published. Dosing information was missing in some studies on diarrhea duration. All findings should be interpreted with caution.

Frequently asked

  • What is Saccharomyces boulardii good for according to research?
    Research shows Saccharomyces boulardii may help reduce diarrhea rate and shorten diarrhea duration, particularly in children with acute diarrhea or gastroenteritis, and in patients with small intestinal bacterial overgrowth (SIBO). Evidence is strongest for reducing diarrhea rate (4 studies) and duration (3 studies), both with moderate evidence strength.
  • What dose of Saccharomyces boulardii is typically used in studies?
    The most common dose reported across studies is 500 mg taken twice daily. This dose was used in studies on reducing diarrhea rate and general diarrhea. For reducing diarrhea duration, dosing was not consistently reported, so the same range may apply but is less certain.
  • Who benefits most from Saccharomyces boulardii?
    The strongest evidence comes from children aged 6 months to 5 years with acute diarrhea or gastroenteritis, and from adults with SIBO associated with long-term proton pump inhibitor (PPI) use. Benefits in other populations, such as healthy adults or the elderly, have not been adequately studied.
  • Are there caveats or limitations in the research on Saccharomyces boulardii?
    Yes, the evidence base is small (only 3–4 studies per outcome), so conclusions should be considered preliminary. Publication bias is a significant concern—null results are less likely to be published. Additionally, dosing information was missing in some studies, and the generalizability to populations beyond children and SIBO patients is unknown.
  • Does Saccharomyces boulardii help reduce diarrhea rate?
    Based on 4 studies with moderate evidence, Saccharomyces boulardii consistently shows beneficial effects on reducing diarrhea rate, with small to moderate effect sizes. The evidence includes randomized controlled trials in children with acute diarrhea and adults with SIBO, using a typical dose of 500 mg twice daily.
  • Does Saccharomyces boulardii help reduce diarrhea duration?
    Three studies report beneficial effects on reducing diarrhea duration, with effect sizes ranging from small to large. A meta-analysis of 1,125 children found a large effect—reducing duration by approximately 1.6 days. However, dosing information was not consistently reported, and all studies focused exclusively on children.

Safety profile

9 studies reporting safety data

Across 9 clinical studies reporting safety data on Saccharomyces boulardii, no specific adverse events were found to be increased compared to control, and no serious adverse events were reported. Two findings indicated no significant difference in adverse events or diarrhea after adjustment for multiple comparisons, while the remaining studies described the probiotic as well tolerated, with one study noting significantly lower overall adverse events (17.0% vs. 55.7%) and antibiotic-associated diarrhea (2.0% vs. 46.4%) in the treatment group. Overall, Saccharomyces boulardii was consistently characterized as safe and well tolerated across the available trials.

Caveats: Most studies were short-term and primarily assessed efficacy; safety monitoring was not the primary endpoint, so rare or long-term adverse events may not have been captured. The evidence base is limited to 9 studies, and findings may not generalize to all populations (e.g., immunocompromised individuals) or formulations.

Most-studied combinations with Saccharomyces boulardii

most supplement research is combination research
Also studied with:Lactobacillus rhamnosus GG (2)

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