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1. https://ods.od.nih.gov/factsheets/VitaminB12-HealthProfessional/
2. https://ods.od.nih.gov/factsheets/VitaminB12-Consumer/
3. https://www.nhs.uk/medicines/cyanocobalamin/
4. https://journals.sagepub.com/doi/abs/10.3181/0703-MR-67
6. https://www.nhs.uk/conditions/vitamins-and-minerals/vitamin-b/
7. https://www.nhs.uk/conditions/vitamin-b12-or-folate-deficiency-anaemia/symptoms/
8. https://www.sciencedirect.com/science/article/abs/pii/S1359511323000363
9. https://www.redcrossblood.org/local-homepage/news/article/function-of-blood-cells.html
10. https://www.nhlbi.nih.gov/health/anemia/vitamin-b12-deficiency-anemia
11. https://pubmed.ncbi.nlm.nih.gov/8914118/
12. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5579396/
13. https://www.nichd.nih.gov/health/topics/neuro/conditioninfo/functions
14. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6491933/
15. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9190671/
16. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5734110/
17. https://pubmed.ncbi.nlm.nih.gov/34116377/