OptiBac Probiotics \'Saccharomyces boulardii\' has been created especially for those seeking a natural option. It contains the internationally acclaimed strain of Saccharomyces boulardii in a pure supplement with no additives or fillers. This well-researched and unique strain has been used safely around the world for over 50 years. Suggested for daily use each capsule provides 5 billion live microorganisms that will survive through stomach acidity and reach the gut alive.