Saccharomyces boulardii is a nonpathogenic yeast strain. In contrast to bacteria which comprise more than 99% of human flora, yeast accounts for less than 1%. Nonetheless, Saccharomyces boulardii is a particularly beneficial yeast (and it’s antibiotic-resistant, unlike bacteria). When lyophilized, Saccharomyces boulardii resists bile salts (which is crucial since it needs to get past some very harsh digestion). Recent studies exhibit the stable viability of Saccharomyces boulardii. Compared to other strains, it has a higher survival rate in an acidic environment and resists high temperatures.4 This viability allows Saccharomyces boulardii to readily colonize the gut.Hypromellose, microcrystalline cellulose, vegetable magnesium stearate, silica.Saccharomyces boulardiiOther Ingredients