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Head-to-head evidence comparison — which supplement is right for you?
Multivitamin wins 2 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Probably helps
8 of 12 studies with measurable effects showed benefit.
Top outcomes
Verdict
Probably helps
9 of 18 studies with measurable effects showed benefit.
Top outcomes
Shared outcomes (1)
Outcomes where both Multivitamin and Vitamin A have evidence — compare verdict strength side-by-side.
1 serving daily (as directed on label, typically 1-2 tablets/capsules)
With breakfast, With lunch (if GI sensitive)
Capsule or softgel
2500-5000 IU daily (retinol); up to 25000 IU (beta-carotene)
With fat-containing meal, Any time of day
Mixed carotenoids or low-dose retinyl palmitate
Chronic excess preformed vitamin A increases risk of hypervitaminosis A (headache, nausea, liver damage, bone loss), teratogenicity in pregnancy, and may impair vitamin D receptor signaling.
Do not combine standalone preformed vitamin A with a multivitamin unless prescribed. Beta-carotene forms are safer due to conversion regulation. Pregnant individuals should be especially cautious; total preformed vitamin A should not exceed 3000 mcg RAE/day.
3-6 months
4-8 weeks
2-6 weeks
6-12 weeks
2-4 weeks
2-4 weeks
4-8 weeks
With chronic excess
Effect of multivitamin-mineral supplementation versus placebo on cognitive function: results from the clinic subcohort of the COcoa Supplement and Multivitamin Outcomes Study (COSMOS) randomized clinical trial and meta-analysis of 3 cognitive studies within COSMOS
The American Journal of Clinical Nutrition (2024) · Meta analysis · n=5765
Multivitamin-mineral supplementation significantly improved global cognition vs placebo (pooled meta-analysis)
Multivitamin Supplementation Improves Memory in Older Adults: A Randomized Clinical Trial
The American Journal of Clinical Nutrition (2023) · Rct · n=3562
Daily multivitamin supplementation for 3 years significantly improved immediate and delayed recall memory
Effects of cocoa extract and a multivitamin on cognitive function: A randomized clinical trial
Alzheimer's & Dementia (2023) · Rct · n=2262
Multivitamin-mineral supplementation (not cocoa extract) drove significant cognitive improvements in COSMOS-Mind
Effects of primary or secondary prevention with vitamin A supplementation on clinically important outcomes: a systematic review of randomised clinical trials with meta-analysis and trial sequential analysis
BMJ open (2024) · Meta analysis · n=672
Vitamin A did not reduce mortality in individually randomised trials (RR 0.99, 95% CI 0.93 to 1.05; I²=32%; p=0.19; 105 trials; moderate certainty), and this effect was not affected by the risk of bias.
Vitamin and Mineral Supplementation During Pregnancy on Maternal, Birth, Child Health and Development Outcomes in Low- and Middle-Income Countries: A Systematic Review and Meta-Analysis
Nutrients (2020) · Meta analysis · n=451723
IFA supplementation showed notable improvement in maternal anemia and the reduction in low birthweight, whereas LNS supplementation had no apparent effect on outcomes; further research that compares LNS and MMN supplementation could help understand differences with these commodities.
Vitamin A supplements for reducing mother-to-child HIV transmission
The Cochrane database of systematic reviews (2017) · Meta analysis · n=6601
Antepartum or postpartum vitamin A supplementation, or both, probably has little or no effect on mother-to-child transmission of HIV in women living with HIV infection and not on antiretroviral drugs.
Based on COSMOS trials (n=5765) showing equivalent of 2.0 years cognitive decline prevention. Effects most pronounced in those with cardiovascular disease. Study duration was 3 years. Effectiveness reflects conservative interpretation of memory and global cognition improvements.
AI-estimated from published studies. Interpret as directional guidance.
Multivitamin has a higher evidence score (6/10 vs 7/10) and wins in 2 of 3 categories.
For support immune system, Multivitamin has a higher relevance score (82 vs 75).
Caution: Chronic excess preformed vitamin A increases risk of hypervitaminosis A (headache, nausea, liver damage, bone loss), teratogenicity in pregnancy, and may impair vitamin D receptor signaling. Do not combine standalone preformed vitamin A with a multivitamin unless prescribed. Beta-carotene forms are safer due to conversion regulation. Pregnant individuals should be especially cautious; total preformed vitamin A should not exceed 3000 mcg RAE/day. Always consult a healthcare provider before combining these supplements.