Travel Size MannanOligoSaccharides Enhanced Intestinal Tract Support Strains Matter Jarrow Formulas' Probiotics Contains Documented Strains Room Temperature Stable 5 Billion Per Capsule Probiotic Supplement Vegan Gluten FreeSaccharomyces Boulardii + MOS contains the probiotic yeast Saccharomyces intestinal tract. This strain helps protect and maintain a normal intestinal microflora. It also works to restore the normal intestinal microflora when possible disruptions may occur, such as during travel or the intake of certain medications. MOS (MannanOligoSaccharides) is an oligosaccharide from the cell walls of S. cerevisiae that can discourage bacteria from adhering to the epithelial cells and reduce their proliferation.