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Dietary SupplementGI SupportGluten FreeSacro-B (Saccharomyces boulardii) is a yeast species that enhances immune function in the gut by increasing sIgA and is effective for antibiotic-associated diarrhea.Saccharomyces boulardii is a yeast species that can provide substantial support to the health of the gastrointestinal tract. In clinical studies Saccharomyces boulardii has been demonstrated to increase the production of secretory IgA the first-line defense immunoglobulin of the gastrointestinal tract.