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Cognitive supplements span four very different goals — sharpening focus right now, building memory over months, protecting the brain over decades, and managing mood and anxiety in the meantime. Different mechanisms, different evidence bases, different time horizons.
Top picks: L-Theanine, Probiotics, and Saffron — full evidence and dosage details below.
Pick the outcome you actually care about for the most relevant supplements.
Improve concentration and attention
See ranked supplements
Enhance cognitive retention
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Protect long-term brain health and slow cognitive ageing
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Lower stress and calm the mind
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Improve adaptability to chronic stress and recovery from stressors
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Improve emotional well-being
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Ranked by how many of this area's outcomes each supplement shows pooled benefit on. Click a row for the per-outcome breakdown.
The Caffeinated Brain Part 1: The Effects of Caffeine on Event-Related Potentials (ERPs)-A Systematic and Mechanistic Review
2026 · Nutrients · systematic-review
Pharmacological interventions for ADHD: a systematic review and dose-effect network meta-analysis
2026 · The lancet. Psychiatry · meta-analysis
Altered gut microbiome function in ADHD: More Prevotella, less vitamin B12 biosynthesis, and beneficial modulation by synbiotic treatment
2026 · Brain, behavior, and immunity · rct
The relationship between antioxidant vitamins and mental disorders: a meta-analysis
2026 · Food & function · meta-analysis
The effect of 5-hydroxytryptophan, a serotonin precursor, on adults with high levels of Attention Deficit Hyperactivity Disorder traits: A randomised, controlled trial
2026 · PloS one · rct
Practical, evidence-tiered guides on these topics.
Caffeine+L-theanine works; bacopa needs weeks; most "brain pills" are hype. The honest tier list.
Magnesium, riboflavin, CoQ10 — the supplements with real migraine-prevention evidence (and doses).
Saffron, EPA omega-3, SAMe have real adjunct evidence — but these aren’t a substitute for care, and some interact dangerously.
Ashwagandha, L-theanine, magnesium, saffron — what actually helps stress, and the safety caveats.
Melatonin, magnesium, glycine, L-theanine — tiered by evidence, plus a wind-down timeline.
Pick your specific goals and we'll match supplements based on the evidence for each one.
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