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Saccharomyces cerevisiae

What does the research say about Saccharomyces cerevisiae?

6 health outcomes synthesised

Saccharomyces cerevisiae, a probiotic yeast, has been studied across 6 health outcomes, including inflammation, immune function, and antioxidant status. The strongest evidence (6 papers) suggests moderate beneficial effects on reducing inflammation, though much of this research comes from animal and in vitro studies. No consistent effective dose has been reported across outcomes, and human data remain limited.

Strongest evidence: The strongest evidence is for Reduced Inflammation, supported by 6 studies (5 animal/in vitro, 1 small RCT with n=12). All reports beneficial effects with moderate effect sizes, and no consistent dose or form was identified. Improved Immune Function (5 studies, including a systematic review of 640 humans) shows moderate benefits, though no studies reached statistical significance.

Mixed or weaker evidence: Outcomes with low or very low evidence include Improved Total Antioxidant Status (3 animal/cell studies), Improved Intestinal Barrier Function (3 animal/cell studies), Reduced Blood Pressure (3 in vitro/in silico studies), and Improved Growth Performance (3 narrative reviews in animals). All show beneficial effects, but human data are absent for each.

Effective dose patterns: No effective dose ranges have been established across outcomes, as dosing was either not reported or varied widely. This is a key gap in the evidence base.

Population insights: Human studies are sparse; the only human RCT (n=12) addressed inflammation. A systematic review on immune function included 640 humans at risk for viral/respiratory infections. Other findings derive from animal models (e.g., broiler chicks, pigs, poultry, swine, horses, ruminants).

Notable caveats: Publication bias is flagged across nearly all outcomes, as null results are less likely to be published. Most studies are preclinical (animal or in vitro), limiting direct applicability to humans. Small study counts (3–6 per outcome) and lack of statistical significance in several studies further weaken conclusions.

Frequently asked

  • What is Saccharomyces cerevisiae good for according to research?
    Research suggests Saccharomyces cerevisiae may have moderate beneficial effects on reducing inflammation (6 studies, including 1 small human trial) and improving immune function (5 studies, including a systematic review of 640 humans). Benefits are also reported for total antioxidant status, intestinal barrier function, blood pressure, and growth performance, but these findings come exclusively from animal or laboratory studies.
  • What dose of Saccharomyces cerevisiae is typically used in studies?
    No consistent effective dose has been reported across the studies reviewed. Most studies did not provide sufficient dosing information, and when doses were reported, they varied widely depending on the outcome and population. This is a major limitation of the current evidence.
  • Who benefits most from Saccharomyces cerevisiae?
    The most relevant human evidence comes from a systematic review of 640 people at risk for viral or respiratory infections, showing potential immune benefits. For inflammation, a single small human trial (n=12) showed moderate effects. Other populations studied are exclusively animal models, so benefit in humans for other outcomes remains unclear.
  • Are there caveats or limitations in the research on Saccharomyces cerevisiae?
    Yes. Publication bias is a concern across most outcomes, as positive results are more likely to be published. The evidence base is small (3–6 studies per outcome) and largely based on animal or in vitro studies, with very few human trials. Many studies also lacked statistical significance or reported inconsistent doses.
  • Does Saccharomyces cerevisiae help with inflammation?
    Yes, 6 studies all reported moderate beneficial effects on inflammation, ranging from small to large effect sizes. However, only one small human RCT (n=12) has been conducted; the rest are animal or in vitro studies. The evidence is considered low overall, and no consistent dose was identified.
  • Does Saccharomyces cerevisiae help with blood pressure?
    Three studies reported beneficial effects on blood pressure-related outcomes, but all were in vitro or in silico analyses of peptide sequences, not human trials. Effect sizes were small to moderate, but none reached statistical significance. Human evidence is absent, so applicability to clinical blood pressure reduction is uncertain.

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