Evidence-based cognitive enhancement is achievable without high-risk compounds. The safety-first stack prioritizes compounds with ≥2 human RCTs, no significant dependency risk, and well-characterized safety profiles: L-Theanine + caffeine (gold standard for acute focus), Bacopa monnieri (12-week memory consolidation), Magnesium L-Threonate (sleep and synaptic plasticity), and Rhodiola rosea (anti-fatigue). Alpha-GPC and Citicoline are effective cholinergic precursors, with Citicoline preferred if TMAO concerns are relevant. NACET shows promise but lacks sufficient direct human RCT evidence to fully recommend — NAC's established evidence partially supports its use.
18 sources 3/4 moderate Updated 2026-04-15