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Goal
Sharper focus
What helps you concentrate and stay on task?
Clearer attention, fewer foggy hours.
Research says what works on average. A free account lets you test any of these on yourself for 14 days and see what works for you.
Start freeSupplements and compounds
Ranked by evidence, then by price. A verdict is the research; your 14-day log is the answer.
CaffeineCompound
Worth itEvidence A
Caffeine for focus: it works, and the timing is the whole game
$0–10/mo
L-Theanine (supplement)Supplement
HoldEvidence C
L-theanine for focus: a calmer edge, not a sharper one
$8–20/mo
Verdicts summarise published research at the population level and never claim an effect for you. Safety notes and sources are on every verdict page. Not medical advice.