Probiotics are live bacteria and yeasts that are thought to improve health. The most common probiotics include lactobacillus, bifidobacteria, and Saccharomyces boulardii.

Many bacteria and other organisms live in our bodies normally. These "good" bacteria and yeasts can help break down food, absorb nutrients, and fight off "bad" organisms that might cause diseases. Probiotics are sometimes taken as supplements and are also found in foods such as yogurt.

Probiotics are used for many different types of diarrhea, irritable bowel syndrome (IBS), constipation, and many other conditions. Keep in mind that not all probiotics have the same effects. So, one probiotic or combination of probiotics may be helpful for certain conditions, while other probiotics are not. Also, there is no good evidence to support using any probiotics for COVID-19.
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