Best Supplements for ADHD & Focus
Supplements with clinical evidence for attention, working memory, and executive function in ADHD and healthy adults.
ADHD affects approximately 5-7% of children and 2-5% of adults. While medication (stimulants, non-stimulants) remains the gold standard, several supplements have demonstrated clinically meaningful effects on attention and cognition — either as standalone interventions or alongside medication. We review the evidence by strength.
Caffeine + L-Theanine
The most evidence-backed acute focus stack. Theanine attenuates caffeine-induced jitter and anxiety while preserving alertness. Meta-analyses confirm improved attention switching, accuracy, and reduced reaction time. Preferred over caffeine alone for sustained focus tasks.
Tolerance to caffeine develops quickly. Avoid within 8–10h of sleep. Dependency possible with daily use — consider cycling.
Omega-3 (EPA/DHA)
Meta-analysis of 16 RCTs in children with ADHD: EPA supplementation significantly reduced inattention and hyperactivity symptoms. EPA-dominant formulas outperform DHA-dominant. Effect size modest but clinically meaningful, especially in EPA-deficient individuals.
Effect is most pronounced when baseline EPA levels are low. Not a replacement for medication in moderate-severe ADHD. Takes 8–12 weeks to see full benefit.
Creatine Monohydrate
Meta-analysis of 16 RCTs: creatine improved working memory (SMD=0.31), attention (SMD=-0.31), and processing speed (SMD=-0.51). Benefits most pronounced under stress, sleep deprivation, or in vegetarians with lower baseline brain creatine.
Effects on attention are secondary to its primary use for muscle/performance. More research needed specifically in ADHD populations.
Magnesium
ADHD is associated with lower magnesium levels. Several trials show supplementation reduces hyperactivity and improves attention, particularly in children who are magnesium-deficient. Threonate may have superior brain penetration.
Evidence stronger in children than adults. Effect is largely dependent on baseline deficiency status. Most adults with ADHD are worth testing and supplementing if deficient.
Zinc
Low zinc levels correlate with ADHD severity. Small RCTs show modest reduction in hyperactivity and impulsivity symptoms. Zinc deficiency is common and may reduce dopamine transporter function.
Evidence base is small. High-dose zinc supplementation (>40mg/day) can deplete copper. Only supplement if deficiency is confirmed.
How We Rate Evidence
Browse other conditions
This analysis is based on peer-reviewed research retrieved from PubMed and the Cochrane Library. This is educational content, not medical advice. Always consult a healthcare provider before starting any supplement regimen, especially if you have a diagnosed condition or take medications.