Nutricology Saccharomyces Boulardii - 50 vcaps supply a probiotic, non-colonizing type of yeast which is similar to Brewer’s yeast but is not related to the Candida yeast group. When consumed orally, Saccharomyces Boulardii will produce lactic acid, which assists the body in producing secretory IgA as well as assisting the friendly probiotic bacteria within the G.I. system. Saccharomyces Boulardii is a transitory microorganism that will be discarded from the body if you cease supplementing with it.