cognitive · Outcome
Respond faster in the moments that matter.
How to measure:
Three levers, one stack. Each works through a different mechanism. They compound.
Noticeable
100-200mg
Evidence
Effect size
Corpus
21 papers
12 small · 12 moderate · 4 large · 3 unclear
“Caffeine supplementation does not significantly improve reaction time agility test performance in soccer players compared to placebo.”
Minimal
45-120 min, 3-4x per week
Evidence
Effect size
Corpus
13 papers
11 small · 6 moderate · 2 large · 1 unclear
No corpus-backed pick yet
We require at least 3 corpus papers for a food to surface here. The literature on this outcome × pillar is still being extracted.
Everything we found, ranked by how strongly we recommend it. Tap any to see the studies.
Top pick
The one we recommend first
Also recommended
Evidence-backed alternatives or additions
Worth considering
Only in specific contexts (see card)
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Every pick has two signals. They answer different questions and we never bundle them into one number.
Effect size
How big is the change on reaction time, in the units that matter for this outcome.
Confidence
How sure are we the effect is real for reaction time, given the studies we have.
For every pick, the “papers” number is how many studies we've cataloged that test this entity for reaction time. “Favorable” means the study reported the direction you want.
The tier badge (S, A, B…) on the entity itself is its overall research confidence across all outcomes. It's the same letter wherever you see this entity on the site, not specific to reaction time.
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“Glutamine dipeptide supplementation increased the magnitude of resistance training's effect on response time in the Stroop test, reducing latency time by approximately 50%.”