Best Supplements for Focus & Cognition
Cognitive aging tracks proteostasis, mitochondrial function, and neuroinflammation more than any single "nootropic" pathway. These compounds act on those mechanisms and carry human evidence — brain fog also warrants ruling out sleep, thyroid, and B12 with your physician.
Ranked by strength of human evidence (Tier A > B > C) and mechanistic fit — computed from the compound registry, not hand-picked. Every entry links to its full evidence deep-dive with PubMed citations. Educational only, not medical advice.
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Glycine
Tier BGlutathione Precursor / Multi-Pathway — Tier B.
3g PM (sleep) or up to 15g/day divided (metabolic)·PM·3 PMIDs - 2
NMN
Tier ANAD+ Restoration — Tier A.
250–500mg NMN·AM·3 PMIDs - 3
CoQ10 (Ubiquinol)
Tier BMitochondrial Electron Transport Chain — Tier B.
100–300mg ubiquinol daily (300mg if on statins)·AM/PM·3 PMIDs - 4
Omega-3 (EPA + DHA)
Tier ASpecialized Pro-resolving Mediators (SPMs) — Tier A.
2–4g combined EPA+DHA daily (with fat-containing meals)·AM/PM·3 PMIDs - 5
GlyNAC
Tier AGlutathione Synthesis — Tier A.
600mg glycine + 600mg NAC·AM·2 PMIDs - 6
Curcumin (Curcuminoids)
Tier BNF-κB Suppression / Nrf2 Activation — Tier B.
1,000–1,500mg/day curcuminoids (enhanced-bioavailability form, split AM/PM with fat)·AM/PM·3 PMIDs - 7
Magnesium (Glycinate / Threonate)
Tier BATP-Mg²⁺ Cofactor Repletion — Tier B.
200–400mg/day elemental (glycinate for tolerance; L-threonate for cognitive use)·PM·3 PMIDs - 8
Sulforaphane
Tier ANRF2 Activation — Tier A.
10–35mg glucoraphanin·AM·2 PMIDs
The aging mechanisms behind this goal
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What is the best supplement for brain fog?
Omega-3 (DHA) has the deepest human evidence for cognitive support, and magnesium L-threonate is studied specifically for brain magnesium and cognition. Brain fog is often downstream of sleep, inflammation, or a nutrient gap — address those first.