Saccharomyces boulardii is a nonpathogenic, probiotic yeast which nutritionally supports the health of the gastrointestinal tract. This yeast protects against intestinal dysbiosis caused by a disruption in the balance of healthy gut flora. Pure Encapsulations Saccharomyces boulardii contains a minimum of 5 billion live cells per capsule. Saccharomyces boulardii is a natural probiotic that nutritionally supports the gastrointestinal tract by maintaining gut flora balance.