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Description
Unlike many other vitamins, B12 is stored in the liver in substantial quantities, meaning deficiency typically develops gradually over months to years as these reserves become depleted

[DOI] [PMC free article] [PubMed] [Google Scholar] 8

Some people need longer at each step

B12 supports brain function by promoting red blood cell production and oxygen flow

Crossref Gupta R, Hussain A, Misra A
