Best Supplements for Improved Cognitive Function
Ranked by research evidence. Compare 116 supplements across 184 papers from the biomedical literature, with effect direction, evidence strength, and dose range for each.
Top picks by evidence
- Moderate evidence9 studies
Across 9 studies, 7 reported beneficial effects of ginkgo on cognitive function, with effect sizes ranging from small to moderate (mixed). The most studied dose was 240 mg daily (standardized extract EGb 761), and effects were observed primarily in elderly clinical populations with mild cognitive impairment, dementia, or post-stroke cognitive impairment. Median study duration was 70 days, but only 2 of 9 studies reported duration.
Dose: 240 mg daily - Moderate evidence4 studies
Across 4 studies, all reported beneficial effects on cognitive function, with moderate effect sizes observed in 3 studies and a small effect in 1 study. The median study duration was 56 days, suggesting effects may emerge after several weeks. The most specified dose was 1.8 g/day in one acute/chronic RCT, but dosing was not consistently reported.
- Moderate evidence4 studies
Across 3 randomized controlled trials, all 3 reported beneficial effects on cognitive function, with effect sizes ranging from small to large (two small, one large). Studies focused on older adults with mild cognitive impairment or memory complaints. Evidence is preliminary due to the small number of studies.
Top combinations for Improved Cognitive Function
most supplement research is combination research- Very low evidence
Of the 3 studies examining the combination of vitamin D and vitamin C for cognitive function, 1 reported a beneficial effect while 2 found neutral effects. The single beneficial finding came from a systematic review that did not isolate the combination, and the other two reviews/meta-analyses found no significant effect. Compared to vitamin D alone (which showed neutral effects across 3 solo studies), the combination evidence is similarly inconclusive. No consistent dose, form, or duration data were reported across studies.
- ModerateGinkgoAcross 9 studies, 7 reported beneficial effects of ginkgo on cognitive function, with effect sizes ranging from small to moderate (mixed). The most studied dose was 240 mg daily (standardized extract EGb 761), and effects were observed primarily in elderly clinical populations with mild cognitive impairment, dementia, or post-stroke cognitive impairment. Median study duration was 70 days, but only 2 of 9 studies reported duration. · Dose: 240 mg daily7 beneficial2 neutral9 studies
- LowBifidobacterium plantarumAcross 7 studies, all reported beneficial effects of Bifidobacterium plantarum on cognitive function, with effect sizes ranging from small to large. The highest-quality evidence (a meta-analysis of 390 adults) showed small improvements but rated the certainty as low, and only 2 of the 7 studies reached statistical significance. Doses and study durations were not consistently reported, and most studies were narrative reviews with low evidence scores.7 beneficial7 studies
- ModerateLion's ManeAcross 4 studies, all reported beneficial effects on cognitive function, with moderate effect sizes observed in 3 studies and a small effect in 1 study. The median study duration was 56 days, suggesting effects may emerge after several weeks. The most specified dose was 1.8 g/day in one acute/chronic RCT, but dosing was not consistently reported.4 beneficial4 studies
- ModerateBifidobacterium breve MAK40B22BAcross 3 randomized controlled trials, all 3 reported beneficial effects on cognitive function, with effect sizes ranging from small to large (two small, one large). Studies focused on older adults with mild cognitive impairment or memory complaints. Evidence is preliminary due to the small number of studies.4 beneficial4 studies
- ModerateLactobacillus helveticus Rosell-52Across 3 studies, all reported beneficial effects on cognitive function, but effect sizes varied (large in one meta-analysis, small in two reviews). Only one of three studies (the meta-analysis) reached statistical significance (p=0.01). The strongest evidence comes from a meta-analysis of RCTs in patients with depression; other reviews in general adult populations show limited effects.3 beneficial3 studies
- LowBifidobacterium bifidum Rosell-71Across 3 studies, all reported beneficial effects on cognitive function, with effect sizes ranging from small to large (mixed). One meta-analysis found a statistically significant large effect (p=0.01, SMD −0.90) in patients with depression, but the other two reviews were not significant. The evidence base is small and preliminary, with no consistent dose or duration data.3 beneficial3 studies
- LowN-Acetyl CysteineAcross 5 studies on N-acetyl cysteine (NAC) for improved cognitive function, 2 reported beneficial effects (small to moderate), while 3 found neutral results. Most evidence comes from clinical populations (e.g., youth with NF1, mild cognitive impairment), with a median study duration of 126 days. The predominant effect size was small, and the most-studied dose range was approximately 2400 mg/day or 70 mg/kg/day in clinical populations. · Dose: ~2400 mg/day or ~70 mg/kg/day2 beneficial3 neutral5 studies
- LowTurmericAcross 4 studies (2 beneficial, 2 neutral), turmeric (curcumin) shows limited and mixed evidence for small beneficial effects on cognitive function. The median study duration was 84 days, but only 2 studies reported duration, and no consistent dose or form was identified. One large systematic review in 3,582 elderly participants (aged 50–90) found neutral results, while two other reviews reported statistically significant small benefits.2 beneficial2 neutral4 studies
- LowVitamin B9Across 3 studies, 2 reported beneficial effects (one moderate, one small) and 1 reported no effect (small, non-significant). Effects were mixed in magnitude. The median study duration was 176 days, and the evidence primarily comes from clinical populations with cognitive impairment or low folate levels.2 beneficial1 neutral3 studies
- Very lowLactobacillus plantarum HEAL9Across 3 studies, 2 reported small beneficial effects of Lactobacillus plantarum HEAL9 on cognitive function, while 1 study found a neutral effect. The only statistically significant finding came from a low-certainty meta-analysis (MD 4.23 for MMSE), and the evidence base is too small to draw firm conclusions. Effects were predominantly small in magnitude, and no consistent dose or population was identified.2 beneficial1 neutral3 studies
- Very lowVitamin DAcross 4 studies on vitamin D for cognitive function, 1 reported a beneficial effect, while 3 found neutral results; the predominant effect size was small. The one beneficial result was statistically significant, but the overall evidence does not support a clear cognitive benefit. No consistent dose or population emerged from the available data.1 beneficial3 neutral4 studies
- LowVitamin CAcross 3 studies, 1 reported a small beneficial effect of vitamin C on cognitive function, while 2 reported neutral effects. The evidence is inconsistent and the small beneficial signal is tempered by the lack of significance in the majority of studies. No consistent dose or population was identified across the limited evidence base.1 beneficial2 neutral3 studies
- LowVitamin B12Across 3 studies, 2 reported neutral effects (small effect size) and 1 reported a beneficial effect (small effect size). The only statistically significant finding came from a systematic review that did not isolate vitamin B12 from other supplements. The evidence does not support a clear benefit of vitamin B12 for cognitive function in general populations, and effects are predominantly neutral with small magnitude.1 beneficial2 neutral3 studies
- LowSeleniumAcross 3 studies, 1 reported a small beneficial effect of selenium on cognitive function, while 2 found neutral results. The beneficial finding came from a large observational study in adults aged 60+ years, showing a small positive association between blood selenium levels and cognitive scores. The evidence base is too small and mixed to draw firm conclusions.1 beneficial2 neutral3 studies