Saccharomyces Boulardii is a unique bacterial yeast that has been safely used worldwide for more than half a century. - 250mg of Saccharomyces Boulardii per capsule - Five billion live viable colonies of Saccharomyces Boulardii per capsule - The Saccharomyces Boulardii in this supplement will survive the challenges of stomach acid and bile in the human digestive (gastrointestinal) tract - Our Saccharomyces Boulardii undergoes \'lyophilisation\' - a form of freeze-drying which allows the supplement to be shelf-stable so that refrigeration is not necessary. It is also antibiotic resistant - A unique, natural and safe microorganism which has evolved in the human food chain since ancestral times and which has been used worldwide as a food supplement for more than half a century