Best Supplements for Improved Attention Span
Ranked by research evidence. Compare 40 supplements across 52 papers from the biomedical literature, with effect direction, evidence strength, and dose range for each.
Top picks by evidence
- Low evidence3 studies
Across all 3 studies, Bacopa showed beneficial effects on improved attention span, with statistically significant findings in each case. The predominant effect size was small, with one systematic review reporting moderate effects. Effects were typically observed at 60 days based on limited duration data, and one RCT used a dose of 160 mg/day in a clinical population with mild cognitive impairment.
Dose: 160 mg/day - Low evidence3 studies
Across 3 studies, 2 reported beneficial effects of L-theanine on attention span, with effect sizes ranging from small to large. The predominant effect direction is beneficial, but effect sizes are mixed (small to large). The most studied population is healthy adults, including athletes and middle-aged/older individuals, with single doses commonly tested. Evidence is too limited to establish a typical dose range or duration.
- LowBacopaAcross all 3 studies, Bacopa showed beneficial effects on improved attention span, with statistically significant findings in each case. The predominant effect size was small, with one systematic review reporting moderate effects. Effects were typically observed at 60 days based on limited duration data, and one RCT used a dose of 160 mg/day in a clinical population with mild cognitive impairment. · Dose: 160 mg/day3 beneficial3 studies
- LowL-TheanineAcross 3 studies, 2 reported beneficial effects of L-theanine on attention span, with effect sizes ranging from small to large. The predominant effect direction is beneficial, but effect sizes are mixed (small to large). The most studied population is healthy adults, including athletes and middle-aged/older individuals, with single doses commonly tested. Evidence is too limited to establish a typical dose range or duration.2 beneficial1 neutral3 studies