Multivitamin for Cognitive Function
Recent large trials suggest a small cognitive benefit from daily multivitamins in older adults - the first credible positive cognitive signal for this category.
Overview
Verdict
How It Works
Dosing & Protocol
Typical dose
- Recommended dose
- One standard daily multivitamin at around 100% of reference intakes; the COSMOS-Mind and COSMOS-Web trials used a standard formulation daily for 2-3 years
- Expected timeframe
- 1-3 years
Protocol
- form
- A standard once-daily multivitamin. The COSMOS trials used a commercially available formulation
- duration
- Cognitive trial effects emerged over 1-3 years of continuous use
- co factor
- Take with a meal for absorption of fat-soluble vitamins. Evidence is mixed but has genuinely shifted recently. Earlier trials, including the Physicians Health Study II, found no cognitive benefit. The COSMOS programme changed the picture: COSMOS-Mind and COSMOS-Web, randomised placebo-controlled trials in older adults, reported modest improvements in global cognition and episodic memory over two to three years of daily multivitamin use, with a meta-analysis of the COSMOS cognitive trials suggesting an effect equivalent to slowing cognitive ageing by roughly two years. These are real randomised findings, but the effects are small, the population was older and relatively well-educated, cognition measures were largely web-based, and independent replication outside COSMOS is awaited.
- titration
- No titration; do not exceed the labelled dose
- starting dose
- One tablet daily with food
Evidence
What the studies say
Effects of cocoa extract and a multivitamin on cognitive function: A randomized clinical trial
Baker LD, et al.
COSMOS-Mind provides the first evidence from a large, long-term, pragmatic trial to support the potential efficacy of a MVM to improve cognition in older adults.
Effect of multivitamin-mineral supplementation versus placebo on cognitive function: COSMOS-Clinic randomized clinical trial and meta-analysis
Vyas CM, Manson JE, Sesso HD
Pooled COSMOS substudies showed a small but significant benefit on global cognition in older adults.
Effect of multivitamin-mineral supplementation versus placebo on cognitive function: results from the clinic subcohort of COSMOS and meta-analysis of 3 cognitive studies
Vyas CM, Manson JE, Sesso HD
we observed a modest benefit of MVM compared with placebo on global cognition over 2 y
Safety
Caveats
The effects are small and emerge over years - a multivitamin is not a nootropic and you will not notice it working. For cognitive health, the interventions with better evidence are physical activity, blood pressure control, hearing aid use where indicated, not smoking, treating diabetes, social engagement and sleep. Progressive memory loss affecting daily function needs medical assessment, since reversible causes including B12 deficiency, hypothyroidism, depression, sleep apnoea and medication effects are common. Safety ceilings: vitamin A retinol above 3,000 mcg/day is teratogenic and raises fracture risk; vitamin D above 100 mcg (4,000 IU)/day; vitamin B6 above 100 mg/day causes peripheral neuropathy; iron above 45 mg/day is toxic and dangerous in haemochromatosis; zinc above 40 mg/day causes copper deficiency; selenium above 400 mcg/day is toxic. Beta-carotene increased lung cancer risk in smokers in the ATBC and CARET trials - smokers should avoid it. Check for overlap if you take other supplements. Vitamin K in some formulations interacts with warfarin - keep intake consistent and tell your anticoagulation clinic. Use a pregnancy-specific product in pregnancy.
Less likely to help if
Medical Disclaimer
The information provided on this website is for educational and informational purposes only and is not intended as a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition or before starting any supplement regimen.
Individual results may vary. The statements on this website have not been evaluated by the Food and Drug Administration. Products and information are not intended to diagnose, treat, cure, or prevent any disease.