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Overview

Bacillus subtilis (B. subtilis) is a type of probiotic ("good" bacteria) found naturally in the human gut. It's also found in fermented foods.

"Good" bacteria such as B. subtilis might help the body break down food, absorb nutrients, and fight off "bad" organisms that might cause diseases. These bacteria are sometimes added to fermented foods like yogurt and also found in dietary supplements.

People use B. subtilis for diarrhea from antibiotics. It is also used for athletic performance, eczema, constipation, indigestion, gas, irritable bowel syndrome (IBS), and many other conditions, but there is no good scientific evidence to support most of these uses.

Don't confuse B. subtilis with Bacillus coagulans, other probiotics, nattokinase, or with fermented food products such as fermented milk, kefir, or yogurt. These are not the same. Also note that three previously recognized Bacillus subtilis subspecies have recently been reclassified. Some products marketed as B. subtilis might actually contain these newly classified Bacillus species, including Bacillus inaqosorum, Bacillus spizizenii, and Bacillus stercoris.


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