priors.science/reviews/probiotics-and-gut-microbiome

Probiotics and Gut Microbiome

The current evidence on 7 claims, ordered from most established to most contested. Each score is the panel’s evidence certainty — how firmly the literature supports the claim as stated.

7claims tracked
91primary papers reviewed
5 Jul 2026latest evidence review
Weeklyre-scored against new papers
0 Established · 4 Likely · 1 Uncertain · 2 Doubtful  |  four-reviewer panel · PICO Framework
SignalClaimStandingEvidence certaintyCorpus
StableProbiotic colonization of adult gut is transientMicrobiomeLikely80%20
StableProbiotics prevent antibiotic-associated diarrheaClinicalLikely78%20
StableProbiotics reduce irritable bowel syndrome symptom severityClinicalLikely70%16
StableProbiotics reduce upper respiratory tract infection incidenceSystemicLikely66%15
StableProbiotics reduce depressive symptomsSystemicUncertain52%15
StableProbiotics prevent Clostridioides difficile infectionClinicalDoubtful34%12
StableProbiotics raise gut microbial diversityMicrobiomeDoubtful31%20
Standing — what the evidence certainty means
Established≥ 85%Strong, consistent evidence. Unlikely to change.
Likely65–84%Well supported, with some gaps or indirect evidence.
Uncertain40–64%Mixed or limited evidence. Genuinely open.
Doubtful15–39%Little support; the weight of evidence leans against it.
Refuted< 15%The evidence contradicts it — confidently false as stated.
Recent signal
strengthenedNew evidence raised the certainty since the last review.
weakenedNew evidence lowered the certainty since the last review.
newA claim added to the review recently.
StableNo recent change to the standing.
Standing, evidence certainty and corpus are always shown. The study behind each move, why it moved, and the sceptic’s challenge are delivered to subscribers.
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