Best Supplements for Improved Attention Span
Ranked by research evidence. Compare 34 supplements across 39 papers from the biomedical literature, with effect direction, evidence strength, and dose range for each.
Top picks by evidence
- Low evidence3 studies
Across 3 studies, all reported beneficial effects of Bacopa monnieri on attention span, with effect sizes ranging from small to moderate. The most robust evidence comes from a 2024 triple-blinded RCT (62 patients with mild cognitive impairment) showing significant improvements at 60 days with 160 mg/day. Effects typically observed at 4-8 weeks.
Dose: 160 mg/day - Low evidence3 studies
Across 3 studies, 2 reported beneficial effects and 1 found neutral results, with the beneficial effects being small to large in magnitude. The most-studied dose range was approximately 100–400 mg, often as a single dose, in adult populations including athletes and middle-aged/older adults. The median study duration was 84 days, but only 1 of 3 studies reported duration, limiting the strength of this finding.
Dose: 100–400 mg single dose
- LowBacopaAcross 3 studies, all reported beneficial effects of Bacopa monnieri on attention span, with effect sizes ranging from small to moderate. The most robust evidence comes from a 2024 triple-blinded RCT (62 patients with mild cognitive impairment) showing significant improvements at 60 days with 160 mg/day. Effects typically observed at 4-8 weeks. · Dose: 160 mg/day3 beneficial3 studies
- LowL-TheanineAcross 3 studies, 2 reported beneficial effects and 1 found neutral results, with the beneficial effects being small to large in magnitude. The most-studied dose range was approximately 100–400 mg, often as a single dose, in adult populations including athletes and middle-aged/older adults. The median study duration was 84 days, but only 1 of 3 studies reported duration, limiting the strength of this finding. · Dose: 100–400 mg single dose2 beneficial1 neutral3 studies