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Head-to-head evidence comparison — which supplement is right for you?
Multivitamin vs Vitamin K2: Multivitamin has the stronger overall evidence (6 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.
Multivitamin wins 2 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Likely helps
5 of 7 studies with measurable effects showed benefit.
Top outcomes
Verdict
Likely helps
9 of 12 studies with measurable effects showed benefit.
Top outcomes
Shared outcomes (1)
Outcomes where both Multivitamin and Vitamin K2 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
100-200mcg (MK-7)
With a meal containing fat
MK-7 (menaquinone-7)
and 7 more not shown
Complementary coverage of vitamin K-dependent proteins across hepatic (clotting) and extrahepatic (bone, vascular) compartments. Enhanced bone mineral density and reduced vascular calcification compared to either alone.
Beneficial combination. Add MK-7 (90–180 mcg/day) alongside a standard multivitamin for enhanced bone and cardiovascular K2-dependent protein activation. Individuals on warfarin or vitamin K antagonists must not add K2 without medical supervision.
3-6 months
4-8 weeks
2-6 weeks
6-12 weeks
6-12 months
1-3 years
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
Vitamins K2 and D3 Improve Long COVID, Fungal Translocation, and Inflammation: Randomized Controlled Trial
Nutrients (2025) · Rct · n=151
The median age was 46 years; 71% were female and 29% were non-white.
The effect of vitamin K2 supplementation on bone turnover biochemical markers in postmenopausal osteoporosis patients: a systematic review and meta-analysis
Frontiers in endocrinology (2025) · Meta analysis · n=2570
Vitamin K2 (VK2) increased osteocalcin (OC; MD 1.86, 95% CI 1.17-2.56) and bone-specific alkaline phosphatase (BAP; MD 1.49, 95% CI 0.98-2.00).
Vitamin K2 in Managing Nocturnal Leg Cramps: A Randomized Clinical Trial
JAMA internal medicine (2024) · Rct · n=310
Of the 199 enrolled individuals, 108 (54.3%) were female, and the mean (SD) age was 72.3 (5.5) years.
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.
Based on meta-analyses showing 2.17% WMD improvement in lumbar BMD. Effects primarily demonstrated with MK-7 form in postmenopausal women. Combination with vitamin D3 may enhance effects.
AI-estimated from published studies. Interpret as directional guidance.
Multivitamin has a higher evidence score (6/10 vs 6/10) and wins in 2 of 3 categories.
For bone health, Vitamin K2 has a higher relevance score (88 vs 80).
Multivitamin and Vitamin K2 may work well together: Complementary coverage of vitamin K-dependent proteins across hepatic (clotting) and extrahepatic (bone, vascular) compartments. Enhanced bone mineral density and reduced vascular calcification compared to either alone. Beneficial combination. Add MK-7 (90–180 mcg/day) alongside a standard multivitamin for enhanced bone and cardiovascular K2-dependent protein activation. Individuals on warfarin or vitamin K antagonists must not add K2 without medical supervision.
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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.