Saccharomyes boulardii�is a yeast probiotic.�S.�boulardii�has many mechanisms of action including inhibition of some bacterial toxins, anti-inflammatory properties, the ability to stimulate the intestinal mucosa to increase brush-border enzymes, as well as immunostimulatory effects. There is evidence that�S.�boulardii�is beneficial for the treatment of acute gastroenteritis and recurrent infections, as well as for the prevention of antibiotic-associated diarrhea.�S.�boulardii�has been researched in children and infants and has been demonstrated to be a treatment option and used for prevention of infantile gastroenteritis and antibiotic-associated diarrhea.