Saccharomyces boulardii is a yeast, which is a type of fungus.Saccharomyces boulardii was previously identified as a unique species of yeast. But now it is believed to be a strain of Saccharomyces cerevisiae (baker's yeast). Saccharomyces boulardii is used as medicine.

Saccharomyces boulardii is most commonly used for treating and preventing diarrhea, including infectious types such as rotaviral diarrhea in children, diarrhea caused by gastrointestinal (GI) take-over (overgrowth) by "bad" bacteria in adults, traveler's diarrhea, and diarrhea associated with tube feedings. It is also used to prevent and treat diarrhea caused by the use of antibiotics

Uses:-

Saccharomyces boulardii can help prevent diarrhea in adults and children being treated with antibiotics. Saccharomyces boulardii also seems to shorten the duration of diarrhea in children with persistent diarrhea.

Research shows that taking Saccharomyces boulardii by mouth helps improve the appearance of acne.

Taking Saccharomyces boulardii by mouth appears to prevent traveler's diarrhea.

Taking Saccharomyces boulardii seems to reduce the number of bowel movements in people with Crohn's disease.

Some infants develop jaundice after birth due to high bilirubin levels. Giving Saccharomyces boulardii to term infants might prevent jaundice people with cystic fibrosis.

Early research shows that adding Saccharomyces boulardii to standard mesalamine therapy can reduce symptoms in people with mild-to-moderate ulcerative colitis.

While Saccharomyces boulardii is typically used as a remedy for gastrointestinal problems, some individuals also use it for acne, canker sores, high cholesterol, urinary tract infections, and yeast infections.

Several clinical studies have been conducted with boulardii in the treatment and prevention of various forms of diarrhoea. Promising research perspectives have been opened in terms of maintenance treatment of inflammatory bowel diseases. The mechanism of  boulardii action has been partially elucidated.