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Head-to-head evidence comparison — which supplement is right for you?
Magnesium and Multivitamin are closely matched across evidence, studies, and safety.
Verdict
Likely helps
13 of 17 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 Magnesium and Multivitamin have evidence — compare verdict strength side-by-side.
200-350mg elemental magnesium daily
Evening for sleep/relaxation (glycinate), Morning for energy (malate), Anytime (citrate)
Depends on goal - see notes
1 serving daily (as directed on label, typically 1-2 tablets/capsules)
With breakfast, With lunch (if GI sensitive)
Capsule or softgel
Magnesium supplementation enhances the functional efficacy of vitamin D3 and B-vitamins in the multivitamin by providing the essential mineral cofactor for their enzymatic activation and utilization. Improved energy metabolism, sleep, and muscle function outcomes.
Beneficial and complementary combination. Add 200–400mg magnesium (glycinate or malate for best tolerance) to a standard multivitamin. Take magnesium separately from multivitamin by 1–2 hours to minimize competition with calcium and zinc for absorption.
1-2 weeks
1-2 weeks
1 week
Immediate
3-6 months
4-8 weeks
2-6 weeks
6-12 weeks
Magnesium supplementation in pregnancy
The Cochrane database of systematic reviews (2014) · Meta analysis · n=9090
Women receiving magnesium were significantly less likely to require hospitalisation during pregnancy (RR 0.65, 95% CI 0.48 to 0.86; three trials, 1158 women).Of the 10 trials included in the review, only two were judged to be of high quality overall.
Magnesium Supplementation and Blood Pressure: A Systematic Review and Meta-Analysis
Hypertension (2025) · Meta analysis · n=2709
38 RCTs with 2709 participants analyzed
Magnesium and Potassium Supplementation for Systolic Blood Pressure Reduction in the General Normotensive Population: A Systematic Review and Subgroup Meta-Analysis for Optimal Dosage and Treatment Length
Nutrients (2024) · Meta analysis
Both supplements demonstrated greater reductions in SBP for the general population at lower dosages and longer treatment durations.
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
Based on meta-analysis of 38 RCTs with 2709 participants showing -7.68 mmHg reduction in hypertensive individuals. Effects are greatest in those with hypomagnesemia. Limited evidence in normotensive populations.
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.
Both Magnesium and Multivitamin are closely matched — the best choice depends on your specific health goals.
For reduce anxiety & stress, Magnesium has a higher relevance score (85 vs 45).
Magnesium and Multivitamin may work well together: Magnesium supplementation enhances the functional efficacy of vitamin D3 and B-vitamins in the multivitamin by providing the essential mineral cofactor for their enzymatic activation and utilization. Improved energy metabolism, sleep, and muscle function outcomes. Beneficial and complementary combination. Add 200–400mg magnesium (glycinate or malate for best tolerance) to a standard multivitamin. Take magnesium separately from multivitamin by 1–2 hours to minimize competition with calcium and zinc for absorption.