Our intestines are home to a wide variety of bacteria, numbering as many as 100 trillion of about 1,000 species. These various bacteria maintain a good balance in the intestinal environment.
This dense collection of a wide variety of bacteria looks like a flower garden, so it is also called the "gut microflora."
Natto bacillus is a living microorganism and probiotic that works for healthy intestines, and is thought to play a major role in keeping the gut microbiota healthy.

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