What is Saccharomyces boulardii? Saccharomyces boulardii is a probiotic, specifically a type of beneficial nonpathogenic yeast. What are the benefits of Saccharomyces boulardii? Saccharomcyes boulardii has been used in clinical practice for over 30 years for the … [Read more...] about Is Saccharomyces boulardii effective in the treatment of diarrhea?