Vitamin B12 für Age-Related Cognitive Decline
B Evidenz Mindestens eine randomisierte Studie unterstützt dies, mit überwiegend konsistenten Ergebnissen.Combined B12 and folate supplementation slowed brain atrophy rate in MCI patients compared to placebo. Homocysteine reduction appears to be the primary mechanism linking B12 status to cognitive preservation.
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B
Fazit
Combined B12 and folate supplementation slowed brain atrophy rate in MCI patients compared to placebo. Homocysteine reduction appears to be the primary mechanism linking B12 status to cognitive preservation.
Key Study Findings
Review
Vitamin B12 deficiency among older adults and its associations with geriatric syndromes.
Dose: None
vs.: None
Outcome: None
Wirkung: None
None
Population: older adults with vitamin B12 deficiency and geriatric syndromes
Meta-Analysis
Associations between Diet and Cognitive Function in Stroke Survivors: A Systematic Review and Meta-analysis.
Dose: None
vs.: Standard care or placebo
Outcome: Global cognition in stroke survivors
Wirkung: SMD=0.62 (energy-protein); SMD=-0.40 (B-vitamins)
0.009 (protein); 0.02 (B-vit)
Population: Adult stroke survivors (20 trials + 14 observational)
Controlled Clinical Trial
32 weeks
Vitamin B12 supplementation attenuates endoplasmic reticulum stress and neuronal cell death in the cerebral cortex …
Dose: 50 ug/kg diet vs 25 ug/kg diet
vs.: HFHS diet without extra B12
Outcome: ER stress and neuronal cell death in cerebral …
Wirkung: None
None
Population: Male C57BL/6J mice on high-fat high-sucrose diet
Other
Estimating effects of serum vitamin B12 levels on psychiatric disorders and cognitive impairment: a Mendelian …
Dose: None
vs.: None
Outcome: Effect of serum B12 on psychiatric disorders (MR)
Wirkung: OR 1.02 [1.00-1.04] for depression per SD increase
0.11 (depression); 0.39 (educa
Population: General population (Mendelian randomization, large GWAS)
Systematic Review
Impact of Vegan and Vegetarian Diets on Neurological Health: A Critical Review.
Dose: None
vs.: None
Outcome: Neurological health outcomes
Wirkung: None
None
Population: None
Review
Unlocking the cellular mystery: how proton pump inhibitors may alter the dementia landscape.
Dose: None
vs.: None
Outcome: Dementia risk with PPI use
Wirkung: None
None
Population: PPI users and dementia risk (review)
Key Statistics
12
Studien
2800
Teilnehmer
↑
Positive
B
Bewertung
Referenced Papers
Current opinion in …
2026
Nutrients
2025
22 Zitierungen
Brain research
2025
6 Zitierungen
Cureus
2025
4 Zitierungen
Communications medicine
2025
3 Zitierungen
Associations between Diet and Cognitive Function in Stroke Survivors: A Systematic Review and Meta-analysis.
Meta-Analysis
Advances in nutrition …
2025
1 Zitierungen
Nutrition (Burbank, Los …
2025
Journal of clinical …
2024
29 Zitierungen
Current Alzheimer research
2024
14 Zitierungen
Science translational medicine
2024
12 Zitierungen
Food and nutrition …
2024
2 Zitierungen
Homocysteine levels, genetic background, and cognitive impairment in Parkinson's disease.
Meta-Analysis
Journal of neurology
2023
34 Zitierungen
Sustaining an ageing population: the role of micronutrients in frailty and cognitive impairment.
Review
The Proceedings of …
2023
27 Zitierungen
Annals of neurology
2023
15 Zitierungen
Nutricion hospitalaria
2023
13 Zitierungen
Molecular and cellular …
2023
8 Zitierungen
Clinical nutrition ESPEN
2023
5 Zitierungen
Vitamin Supplementation and Dementia: A Systematic Review.
Systematic Review
Nutrients
2022
76 Zitierungen
Vitamins and hormones
2022
28 Zitierungen
Current nutrition reports
2022
25 Zitierungen
International journal of …
2022
23 Zitierungen
The Journal of …
2022
13 Zitierungen
Cognitive function and vitamin B12 and D among community-dwelling elders: A cross-sectional study.
Other
Clinical nutrition ESPEN
2022
12 Zitierungen
Cureus
2022
6 Zitierungen
Cureus
2020
65 Zitierungen
Vitamin B12, B6, or Folate and Cognitive Function in Community-Dwelling Older Adults: A Systematic Review and Meta-Analysis.
Meta-Analysis
Journal of Alzheimer's …
2020
34 Zitierungen
Association between Vitamin B12 levels and cognitive function in the elderly Korean population.
Observational
Medicine
2020
29 Zitierungen
Systematic reviews
2020
29 Zitierungen
Cureus
2020
5 Zitierungen
Revue neurologique
2019
361 Zitierungen
Journal of Alzheimer's …
2018
281 Zitierungen
Over-the-Counter Supplement Interventions to Prevent Cognitive Decline, Mild Cognitive Impairment, and Clinical Alzheimer-Type Dementia: A Systematic Review.
Systematic Review
Annals of internal …
2018
119 Zitierungen
Nutrients
2018
30 Zitierungen
Annals of surgical …
2018
22 Zitierungen
American family physician
2017
282 Zitierungen
Annual review of …
2016
432 Zitierungen
Nutrition research (New …
2016
131 Zitierungen
Is Metformin-Induced Vitamin B12 Deficiency Responsible for Cognitive Decline in Type 2 Diabetes?
Other
Indian journal of …
2016
23 Zitierungen
Journal of biomedical …
2016
Individually modifiable risk factors to ameliorate cognitive aging: a systematic review and meta-analysis.
Meta-Analysis
Climacteric : the …
2015
92 Zitierungen
Annals of Indian …
2015
1 Zitierungen
Neuroscience and biobehavioral …
2014
148 Zitierungen
Nutrition reviews
2014
25 Zitierungen
Nutrition journal
2013
26 Zitierungen
Ontario health technology …
2013
Vitamin B₁₂ status, cognitive decline and dementia: a systematic review of prospective cohort studies.
Systematic Review
The British journal …
2012
87 Zitierungen
Late-adult onset Leigh syndrome.
Case Report
Journal of clinical …
2012
54 Zitierungen
Experimental aging research
2010
21 Zitierungen
The Practitioner
2010
Homocysteine, vitamin B12, folate and cognitive functions: a systematic and critical review of the literature.
Systematic Review
International journal of …
2009
125 Zitierungen
Neurology
2009
124 Zitierungen
Epidemiology (Cambridge, Mass.)
2006
49 Zitierungen
Journal of Alzheimer's …
2006
37 Zitierungen
Dietary folate and vitamin B12 intake and cognitive decline among community-dwelling older persons.
Other
Archives of neurology
2005
263 Zitierungen
Neurology India
2004
71 Zitierungen
Folic acid with or without vitamin B12 for cognition and dementia.
Systematic Review
The Cochrane database …
2003
263 Zitierungen
Current opinion in …
1998
30 Zitierungen
Dosage & Usage
mg = milligrams · mcg = micrograms (1,000× smaller) · IU = International Units
Übliche Dosierungen
- general:
- 2.4 mcg/day (RDA)
- deficiency:
- 1,000-2,000 mcg/day
- cognitivesupport:
- 500-1,000 mcg/day
Obergrenze: No established UL (water-soluble, low toxicity)
In der Forschung untersuchte Dosierungen
| Dosierung | Dauer | Wirkung | N |
|---|---|---|---|
| None | -- | Positive | -- |
| None | -- | Mixed | -- |
| 50 ug/kg diet vs 25 ug/kg diet | 32 weeks | Positive | -- |
| None | -- | Neutral | -- |
| None | -- | Mixed | -- |
| None | -- | Negative | -- |
| None | -- | Mixed | -- |
| None | -- | Positive | -- |
Beste Einnahmezeit: Morning, on empty stomach for better absorption (sublingual)
Safety & Side Effects
Gemeldete Nebenwirkungen
- ⚠ Generally very well-tolerated
- ⚠ Rare: acne-like eruptions at high doses
- ⚠ Injection site reactions (injectable form)
Bekannte Wechselwirkungen
- ● Metformin (reduces B12 absorption)
- ● Proton pump inhibitors (reduce B12 absorption)
- ● Colchicine (reduces B12 absorption)
Tolerierbare Höchstaufnahmemenge: No established UL (water-soluble, low toxicity)
Konsultieren Sie immer Ihren Arzt, bevor Sie ein Nahrungsergänzungsmittel einnehmen.Konsultieren Sie immer Ihren Arzt, bevor Sie ein Nahrungsergänzungsmittel einnehmen.
Frequently Asked Questions
Does Vitamin B12 help with Age-Related Cognitive Decline?
Based on 12 studies with 2,800 participants, there is moderate evidence from clinical studies that Vitamin B12 may support Age-Related Cognitive Decline management. Our evidence grade is B (Good Evidence).
How much Vitamin B12 should I take for Age-Related Cognitive Decline?
Studies have used various dosages. A commonly studied range is 2.4 mcg/day (RDA). Always consult your healthcare provider before starting any supplement regimen.
Are there side effects of Vitamin B12?
Reported side effects may include Generally very well-tolerated, Rare: acne-like eruptions at high doses, Injection site reactions (injectable form). Most side effects are mild and dose-dependent. Consult your doctor if you experience any adverse reactions.
How strong is the evidence for Vitamin B12 and Age-Related Cognitive Decline?
We rate the evidence as Grade B (Good Evidence). This rating is based on 12 peer-reviewed studies with 2,800 total participants. The overall direction of effect is positive.
Related Evidence
Andere Inhaltsstoffe für Age-Related Cognitive Decline
Vitamin B12 für andere Beschwerden
References
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