Probiotics

surging  probiotics — marketing outpaces the strain-specific evidence

Evidence by outcome

gut / digestiongrade Bmoderate certaintybenefits are strain- and condition-specific (e.g. some IBS, antibiotic-associated diarrhea)
gut / digestiongrade Bmoderate certaintyreduces antibiotic-associated diarrhea and helps some IBS symptoms (strain-specific)
moodgrade Clow certaintysmall effects on mood/anxiety in some "psychobiotic" trials; strain-specific, heterogeneous

People say · Evidence shows

Probiotics fix any gut problem

aheadlargemarketing claim

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sources: PMID:00000025 · PMID:20000110 · PMID:42221774