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Vitamin B12 pour Nutritional Deficiency Cognitive Impairment

A

A study of 202 people with cognitive impairment and low B12 levels found supplementation improved cognition in 84% of patients and memory/attention scores in 78%. Subclinical low-normal B12 is associated with increased risk of neurodegenerative conditions.

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En conclusion

A study of 202 people with cognitive impairment and low B12 levels found supplementation improved cognition in 84% of patients and memory/attention scores in 78%. Subclinical low-normal B12 is associated with increased risk of neurodegenerative conditions.

Key Study Findings

Observational Study n=2582
Relationship Between Serum Vitamins and Cognitive Impairment in the Elderly: A Study Based on the …
Dose: None vs: None Outcome: Cognitive impairment risk Effet: OR=0.695 (Vit D); OR=0.777 (FA) p=0.003 (Vit D); p=0.034 (FA)

Population: Elderly participants aged 60+ from NHANES 2011-2014

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 Effet: 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)

Review
Vitamin B12 Deficiency: Common Questions and Answers.
Dose: None vs: None Outcome: None Effet: None None

Population: Adults with vitamin B12 deficiency

Review
B-vitamins and one-carbon metabolism during pregnancy: health impacts and challenges.
Dose: None vs: None Outcome: Pregnancy outcomes and offspring neurodevelopment Effet: None None

Population: Pregnant women (review)

Randomized Controlled Trial Double-blind
Relationships of B12 and Homocysteine with Outcomes in the SURE-PD, SURE-PD3, and STEADY-PDIII Trials.
Dose: Vitamin B12 (measured, not supplemented) vs: Within-trial comparison Outcome: B12/homocysteine association with PD outcomes Effet: None None

Population: Early Parkinson's disease patients

Review
Excess Folic Acid and Vitamin B12 Deficiency: Clinical Implications?
Dose: >5 mg/day vs: None Outcome: B12 deficiency exacerbation by excess folic acid Effet: None None

Population: Older adults and at-risk B12 deficient individuals

Key Statistics

25

Études

3500

Participants

Positive

A

Note

Referenced Papers

American family physician 2025
Food and nutrition … 2024 19 citations
The Pan African … 2021 20 citations
The Senior care … 2021 2 citations
Journal of Alzheimer's … 2018 281 citations
European journal of … 2012 225 citations
Evidence report/technology assessment 2006
The Cochrane database … 2003 263 citations
Current opinion in … 1998 30 citations

Dosage & Usage

mg = milligrams · mcg = micrograms (1,000× smaller) · IU = International Units

Posologies couramment utilisées

general:
2.4 mcg/day (RDA)
deficiency:
1,000-2,000 mcg/day
cognitivesupport:
500-1,000 mcg/day

Limite supérieure : No established UL (water-soluble, low toxicity)

Posologies étudiées dans la recherche

Posologie Durée Effet N
None -- Positive 2582
None -- Mixed --
None -- Mixed --
None -- Positive --
Vitamin B12 (measured, not supplemented) -- Positive --
>5 mg/day -- Negative --
None -- Positive --
None -- Positive --

Moment optimal de prise : Morning, on empty stomach for better absorption (sublingual)

Safety & Side Effects

Effets indésirables signalés

  • Generally very well-tolerated
  • Rare: acne-like eruptions at high doses
  • Injection site reactions (injectable form)

Interactions connues

  • Metformin (reduces B12 absorption)
  • Proton pump inhibitors (reduce B12 absorption)
  • Colchicine (reduces B12 absorption)

Apport maximal tolérable : No established UL (water-soluble, low toxicity)

Consultez toujours votre professionnel de santé avant de commencer tout complément alimentaire.Consultez toujours votre professionnel de santé avant de commencer tout complément alimentaire.

Frequently Asked Questions

Does Vitamin B12 help with Nutritional Deficiency Cognitive Impairment?
Based on 25 studies with 3,500 participants, there is strong evidence from multiple clinical trials that Vitamin B12 may support Nutritional Deficiency Cognitive Impairment management. Our evidence grade is A (Strong Evidence).
How much Vitamin B12 should I take for Nutritional Deficiency Cognitive Impairment?
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 Nutritional Deficiency Cognitive Impairment?
We rate the evidence as Grade A (Strong Evidence). This rating is based on 25 peer-reviewed studies with 3,500 total participants. The overall direction of effect is positive.

Related Evidence

Autres ingrédients pour Nutritional Deficiency Cognitive Impairment

Vitamin B12 pour d'autres pathologies

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