What is Saccharomyces Boulardii?

A friendly yeast. It was previously identified as a unique species of yeast. Now it is believed to be a strain of Saccharomyces cerevisiae. Saccharomyces boulardii also has been used as a probiotic, or "friendly bacteria," to prevent the growth of harmful bacteria in the stomach and intestines. Saccharomyces boulardii is likely effective in alternative medicine as an aid in preventing diarrhea caused by taking antibiotics, or by using a feeding tube.