Do Probiotic Supplements Contain Yeast? What You Need to Know
                                
                                
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                                    4 min read                                
                            
                                Many people assume all probiotics are bacteria, but this is a common misconception; the International Scientific Association for Probiotics and Prebiotics defines them as live microorganisms, which can include yeasts. Probiotic supplements can and often do contain beneficial yeast strains, most notably *Saccharomyces boulardii*, which plays a crucial role in maintaining gut health.