Probiotic Yeast + MOS Vegetarian Capsules MOS: A Binding Site Decoy For Unfriendly Bacteria Saccharomyces Boulardii One of the Best Substantiated Probiotics 5 Billion Organisms Per Capsule Can Be Taken with Bacterial Probiotics Room-Temperature StableSaccharomyces Boulardii (probiotic yeast) helps protect and maintain intestinal microflora. It also helps restore normal intestinal microflora when possible disruptions may occur, such as during travel or from the intake of certain medications.* MOS is a prebiotic that encourages the clearance of certain bacteria through the gut