Probiotics can evolve inside the body and have the potential to become less effective and sometimes even harmful. Researchers studying a strain of E. coli for sale in Europe as an anti-diarrheal probiotic found that the bacteria’s DNA changed after living in mice’s intestines for a few weeks.

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Probiotics can evolve inside the body and have the potential to become less effective and sometimes even harmful. Researchers studying a strain of E. coli for sale in Europe as an anti-diarrheal probiotic found that the bacteria’s DNA changed after living in mice’s intestines for a few weeks.