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Head-to-head evidence comparison — which supplement is right for you?
Multivitamin vs Vitamin B12: Vitamin B12 has the stronger overall evidence (7.5 vs 6/10); they're alternatives for boost daily energy — the best pick depends on your goals. Take the 60-second quiz for a pick tailored to your goals.
Vitamin B12 wins 2 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Too few graded studies
Top outcomes
Verdict
Likely helps
5 of 6 studies with measurable effects showed benefit.
Top outcomes
1 serving daily (as directed on label, typically 1-2 tablets/capsules)
With breakfast, With lunch (if GI sensitive)
Capsule or softgel
500-1000mcg daily for maintenance; higher for deficiency
Morning (may be energizing), With or without food
Methylcobalamin (sublingual)
and 7 more not shown
Generally safe duplication; rarely clinically significant. Unnecessary cost and high urinary excretion of excess cyanocobalamin.
Low clinical concern. If correcting a suspected deficiency, confirm B12 status (serum B12 + methylmalonic acid) before high-dose supplementation, and be aware that the folate in a multivitamin can mask the anaemia of B12 deficiency.
3-6 months
4-8 weeks
2-6 weeks
6-12 weeks
2-4 weeks
4-8 weeks
Weeks to months
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.
Efficacy of different routes of vitamin B12 supplementation for the treatment of patients with vitamin B12 deficiency: A systematic review and network meta-analysis
Irish journal of medical science (2024) · Meta analysis · n=4275
Regarding the hemoglobin level, the pooled effect sizes showed no difference between all routes of administration that could reach statistical significance.
Dosage exploration of combined B-vitamin supplementation in stroke prevention: a meta-analysis and systematic review
The American journal of clinical nutrition (2024) · Meta analysis · n=76664
In areas without and with partial folic acid fortification, combined B-vitamin supplementation significantly reduced the risk of stroke by 34% [RR: 0.66; 95% confidence interval (CI): 0.50, 0.86] and 11% (RR: 0.89; 95% CI: 0.79, 1.00), respectively.
Vitamin Status in Patients with Phenylketonuria: A Systematic Review and Meta-Analysis
International journal of molecular sciences (2024) · Meta analysis · n=3157
24 studies compared 770 people with early-treated PKU and 2387 healthy controls.
Vitamin B12 has a higher evidence score (7.5/10 vs 6/10) and wins in 2 of 3 categories.
For boost daily energy, Vitamin B12 has a higher relevance score (85 vs 75).
Generally safe duplication; rarely clinically significant. Unnecessary cost and high urinary excretion of excess cyanocobalamin. Low clinical concern. If correcting a suspected deficiency, confirm B12 status (serum B12 + methylmalonic acid) before high-dose supplementation, and be aware that the folate in a multivitamin can mask the anaemia of B12 deficiency. Consult a healthcare provider for personalized advice.
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Safe, but no benefit if you’re not filling a gap. Who actually needs one — and who doesn’t.
Start with 2–3 foundations, add one at a time, build by goal — without wasting money.
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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.