Saccharomyces boulardii (S. boulardii) is a type of probiotic ("friendly" organism). It's a yeast that is actually a strain of Saccharomyces cerevisiae.

"Friendly" organisms such as S. boulardii can help fight off "bad" organisms that might cause diseases. S. boulardii is different from other strains of S. cerevisiae, commonly known as brewer's yeast and baker's yeast.

People commonly use S. boulardii for treating and preventing diarrhea, including rotaviral diarrhea in children. It's also used for other types of diarrhea, acne, a digestive tract infection that can lead to ulcers, and many other conditions, but there is no good scientific evidence to support many of its other uses. There is also no good evidence to support using S. boulardii for COVID-19.

Don't confuse S. boulardii with other probiotics, or with fermented food products such as fermented milk, kefir, or yogurt. These are not the same.

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