priors.science/reviews/caffeine-and-performance

Caffeine and Performance

The current evidence on 12 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.

12claims tracked
113primary papers reviewed
5 Jul 2026latest evidence review
Weeklyre-scored against new papers
0 Established · 4 Likely · 6 Uncertain · 2 Doubtful  |  four-reviewer panel · PICO Framework
SignalClaimStandingEvidence certaintyCorpus
StableCaffeine improves alertnessCognitionLikely72%12
StableCaffeine improves enduranceEnduranceLikely72%12
StableCaffeine offsets sleep-loss deficitsCognitionLikely66%12
StableCaffeine lowers perceived exertionEnduranceLikely66%12
StableCaffeine improves strength and powerStrength PowerUncertain54%12
StableErgogenic effect is dose-dependentDosingUncertain53%12
StableLow doses improve enduranceDosingUncertain50%12
StableCaffeine improves sprint performanceStrength PowerUncertain50%12
StableCYP1A2 genotype moderates the effectIndividualUncertain43%12
StableCaffeine mouth rinse aids performanceDosingUncertain40%12
StableHabitual use blunts the effectIndividualDoubtful34%12
StablePre-exercise caffeine harms sleepAdverseDoubtful31%12
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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