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Head-to-head evidence comparison — which supplement is right for you?
Magnesium vs Multivitamin: Magnesium has the stronger overall evidence (8.5 vs 6/10); they work on different things and are often used together, not either/or. Take the 60-second quiz for a pick tailored to your goals.
Magnesium wins 2 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Mixed evidence
2 of 6 studies with measurable effects showed benefit.
Top outcomes
Verdict
Too few graded studies
Top outcomes
200-250mg 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
and 4 more not shown
and 7 more not shown
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 up to 250mg supplemental magnesium (the EU upper limit, glycinate or malate for best tolerance) to a standard multivitamin, counting the magnesium in the 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
Ten trials involving 9090 women and their babies. 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, median 365 mg elemental magnesium for a median 12 weeks. Systolic BP -2.81 mmHg (95% CI -4.32 to -1.29), diastolic -2.05 mmHg versus placebo.
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=5203
Pooled 5,203 non-overlapping participants from three cognitive substudies of the COSMOS trial of US adults aged 60 or older: COSMOS-Clinic (573), COSMOS-Mind (2,158) and COSMOS-Web (2,472).
Effects of cocoa extract and a multivitamin on cognitive function: A randomized clinical trial
Alzheimer's & Dementia (2023) · Rct · n=2262
COSMOS-Mind: 2,262 older adults (mean age 73, 60% women) randomised in a 2x2 factorial design to cocoa extract and to a commercial multivitamin-mineral, each versus placebo, for 3 years, with cognition tested by telephone.
Long-term multivitamin supplementation and cognitive function in men: a randomized trial
Annals of Internal Medicine (2013) · Rct · n=5947
5,947 male physicians aged 65 or older in the Physicians' Health Study II, randomised to a daily multivitamin or placebo, with up to 4 telephone cognitive assessments over 12 years.
Magnesium has a higher evidence score (8.5/10 vs 6/10) and wins in 2 of 3 categories.
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 up to 250mg supplemental magnesium (the EU upper limit, glycinate or malate for best tolerance) to a standard multivitamin, counting the magnesium in the multivitamin. Take magnesium separately from multivitamin by 1–2 hours to minimize competition with calcium and zinc for absorption.
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The right pick depends on your goals. Answer a few quick questions for a personalised recommendation — or dig into the full evidence on each.