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Archived from the original (PDF) on 2017-08-08
It quickly fixes the shortage, which is key to avoiding or handling serious issues

[DOI] [PMC free article] [PubMed] [Google Scholar] 166.Gao H, Sun X, Rao Y

Subjectively, adequate B12 manifests as maintained energy levels, absence of neurological symptoms like numbness or tingling, and normal cognitive function
