Community observations, not medical advice.Always speak with a qualified healthcare professional.
supplement × Cognitive

Vitamin B12 for Age-Related Cognitive Decline

Water-soluble vitamin required for red blood cell formation, myelin synthesis, and DNA production; deficiency, common in older adults and vegans, causes fatigue and neurological symptoms that supplementation corrects.

-published research: study records
-published research: findings
Not formally gradedcertainty of the research
On this pageOverviewEvidenceCommunity outcomesRelated
Why Vitamin B12 for Age-Related Cognitive Decline?

The connection

Gradual changes in memory, processing speed, and executive function associated with ageing.

Also known as: Methylcobalamin, Cyanocobalamin

Published research

Vitamin B12 × Age-Related Cognitive Decline: at a glance

Every published result for this pair, extracted and audited.

Published research

Vitamin B12 / Age-Related Cognitive Decline: publication years

What this means: Counts describe research quantity, not treatment effectiveness or certainty.

Vitamin B12 / Age-Related Cognitive Decline: publication years (publications, count)
CategoryPublications (count)
20211
20222
20241
20252
← Zoom out: all evidence for Vitamin B12Zoom out: compare compounds for Age-Related Cognitive Decline →
Published research

Vitamin B12 × Age-Related Cognitive Decline: the evidence base

Hand-selected PubMed studies, linked to the originals.

6studies referenced
5journals
2021–2025publication range

Ordered by strength of evidence, then result direction.

01Differences in Ferritin, Vitamin D, and Vitamin B12 Between Fibromyalgia Patients and Healthy Individuals: A Systematic Review and Meta-AnalysisIsmail O, et al. · Musculoskeletal care · 2025PMID 39832803 ↗02Associations between Diet and Cognitive Function in Stroke Survivors: A Systematic Review and Meta-analysisAmanat S, et al. · Advances in nutrition (Bethesda, Md.) · 2025PMID 40355028 ↗03A Systematic Review of Symptoms of Pernicious AnemiaSeage CH, et al. · Food and nutrition bulletin · 2024PMID 38987871 ↗04B vitamins and prevention of cognitive decline and incident dementia: a systematic review and meta-analysisWang Z, et al. · Nutrition reviews · 2022PMID 34432056 ↗05Vitamin Supplementation and Dementia: A Systematic ReviewGil Martínez V, et al. · Nutrients · 2022PMID 35268010 ↗06Effects of Vitamin B12 Supplementation on Cognitive Function, Depressive Symptoms, and Fatigue: A Systematic Review, Meta-Analysis, and Meta-RegressionMarkun S, et al. · Nutrients · 2021PMID 33809274 ↗
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Community experiences

Contributors volunteered; this does not establish treatment effectiveness or population incidence.

Reported changes

No publishable community breakdown is available. This does not establish that no reports exist.

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Important: This page reflects observational, aggregate-only community reporting and independent published research. It is not medical advice, and it does not claim any compound treats, cures, or is effective for any condition. Always consult a qualified healthcare professional before starting, stopping, or changing any supplement or treatment.