Narrative reviewindependent cross-checkabstract checked I-SUP-125 standard review
Vitamin B12 deficiency in babies
Effect of vitamin B12 deficiency on neurodevelopment in infants: current knowledge and possible mechanisms.
Overview
Dror DK et al.. Nutr Rev 2008 · PMID 18454811 · DOI 10.1111/j.1753-4887.2008.00031.x
Babies of mothers with low B12 can develop serious brain and development problems, which improve quickly with B12.
Does the study support the specific claim? No · Methodological quality: low
Plain-language summary
Study explained simply
- What did the researchers want to find out?
To review infant B12 deficiency.
- How was the study done?
Review of case reports.
- How many people, animals or samples were studied?
Published cases.
- What was actually found?
Neurological symptoms respond rapidly to B12.
- How large was the observed effect?
Not applicable.
- What do the results mean in everyday life?
B12 deficiency in pregnancy and breastfeeding must be treated.
- What are the study's limitations?
Case reports only.
- What does it say about Elawady's specific claim?
Contradicts 'no one needs supplements'.
- Do the results apply to Germany and Europe?
Applicable.
- What can explicitly not be concluded from this study?
Cannot estimate how common this is.
Scientific in-depth review
1. Full reference
- Authors
- Dror DK et al.
- Journal
- Nutr Rev
- Year
- 2008
- Identifier
- PMID 18454811 DOI 10.1111/j.1753-4887.2008.00031.x
- Verification
- verified – PubMed efetch 2026-10-26; Crossref works API 2026-10-26
- Retracted
- no
- Corrections
- none
- Extent checked
- abstract only
- Conflicts of interest and funding
No COI statement in PubMed record
2. Research question
Effects and mechanisms of vitamin B12 deficiency on infant neurodevelopment.
3. Study design and population
- Study design
- Narrative review – Narrative review with pooled analysis of published case reports
- Population
Infants of mothers with untreated pernicious anaemia or strict vegetarian diets
- Country
Multinational (case reports)
- Period
Not stated
- Sample size
Pooled case reports (number not stated in abstract)
- Inclusion and exclusion criteria
Published case studies
4. Methods and endpoints
- Exposure / intervention
Infant B12 deficiency
- Comparator
None
- Endpoints
Neurological symptoms; response to supplementation
- Statistical methods
Descriptive pooled case analysis
5. Actual results
- Results
Severe infant B12 deficiency produces irritability, failure to thrive, apathy, anorexia and developmental regression, which respond rapidly to supplementation; possible mechanisms include delayed myelination or demyelination.
- Absolute risks
Not applicable
- Authors' conclusion
Severe infantile B12 deficiency causes neurological symptoms that respond rapidly to supplementation; mechanisms may involve myelination and metabolic disturbances.
6. Strengths
- Summarises rare but serious cases
7. Weaknesses
- Case reports; no denominator
- Narrative
8. Risk of bias
- Orienting tool
- none applicable
- Type of assessment
- simplified assessment (abstract only)
- Full formal assessment
- no
- Overall risk of bias
- not assessable
- Rationale
Case-based review.
9. Assessment of the statistical interpretation
Not applicable.
10. Relevance to the specific claim
Shows the danger of B12 deficiency in infants of B12-deficient mothers; supports the safety note.
11. Independent contrary findings
Rare outcome.
12. Transferability to Germany and Europe
Applicable.
13. Overall methodological judgement
Supports the need to detect and treat B12 deficiency in pregnancy and infancy.
| Multidimensional assessment | |
|---|---|
| Authenticity of the source | verified |
| Methodological quality | low |
| Risk of bias | not assessable |
| Precision of results | not applicable |
| Directness | direct |
| Reproducibility | replicated |
| Consistency with the overall evidence | consistent |
| Regional transferability | high |
| Adequacy of the interpretation (by the archive) | not applicable |
14. Open questions
Long-term outcomes (some case reports describe lasting deficits).
15. Linked fact checks
- No one needs vitamins or supplements: 'there is no such thing as dietary supplements', the body makes its own vitamins, and vitamins are on the forbidden list. – Studies contradicting or limiting the claim