How is it good to have friends but bad to run into a group of criminals?
Not all bacteria are bad, in fact many are instrumental to our gut and skin health (and almost certainly more). When you have a florid infection with bad bacteria (e.g. pneumonia) it’s beneficial to take something that kills that type of bacteria. You will almost always have some collateral damage and kill some of the good bacteria too, which is why diarrhea is such a common side effect of antibiotics.
Your body tends to tolerate good bacteria and so they will repopulate the way they’re supposed to after exposure to antibiotics. Probiotics can speed up and/or maintain this process.
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