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Head-to-head evidence comparison — which supplement is right for you?
Multivitamin wins 3 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Likely helps
5 of 6 studies with measurable effects showed benefit.
Top outcomes
Verdict
Probably helps
8 of 12 studies with measurable effects showed benefit.
Top outcomes
Shared outcomes (1)
Outcomes where both Manganese and Multivitamin have evidence — compare verdict strength side-by-side.
2-5mg daily
With food, Can take with other minerals
Manganese Bisglycinate or Citrate
1 serving daily (as directed on label, typically 1-2 tablets/capsules)
With breakfast, With lunch (if GI sensitive)
Capsule or softgel
Combined manganese intake from multivitamin plus additional mineral supplements can approach the UL. Individuals with liver disease are at higher risk of manganese toxicity as biliary excretion (primary elimination route) is impaired.
Audit total manganese intake if using multiple supplements. Individuals with hepatic disease should use manganese-free formulations. Total supplemental manganese should remain below 11mg/day.
12-24 weeks
4-8 weeks
With chronic excess
3-6 months
4-8 weeks
2-6 weeks
6-12 weeks
Association of Blood Manganese and Preeclampsia: A Systematic Review and Meta-analysis
Biological trace element research (2024) · Meta analysis · n=1113
Pooled results showed that compared to normotensive control, women with PE had significantly lower blood Mn concentration (standardized mean difference: -0.36, 95% confidence interval: -0.50 to -0.22, p < 0.001; I2 = 67%).
Manganese Exposure and Metabolic Syndrome: A Systematic Review and Meta-Analysis
Nutrients (2022) · Meta analysis
Therefore, the present review examined the association between dietary and environmental Mn exposure, and MetS risk.
Serum trace elements and osteoarthritis: A meta-analysis and Mendelian randomization study
Journal of trace elements in medicine and biology : organ of the Society for Minerals and Trace Elements (GMS) (2024) · Meta analysis
The study suggests that there is an association between the occurrence of OA and variations in serum levels of copper, manganese, cadmium, and selenium.
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
Multiple meta-analyses demonstrate dose-dependent neurotoxicity risk. Studies consistently show neurological impairment with excess manganese exposure. Risk estimates are conservative based on childhood neurodevelopment meta-analysis showing IQ decrements with elevated exposure.
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 4/10) and wins in 3 of 3 categories.
For bone health, Multivitamin has a higher relevance score (80 vs 35).
Combined manganese intake from multivitamin plus additional mineral supplements can approach the UL. Individuals with liver disease are at higher risk of manganese toxicity as biliary excretion (primary elimination route) is impaired. Audit total manganese intake if using multiple supplements. Individuals with hepatic disease should use manganese-free formulations. Total supplemental manganese should remain below 11mg/day. Consult a healthcare provider for personalized advice.