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do b12 injection work Vitamin Injections: What You Need To Know Vitamin B12 Injections: Benefits and
Description
Several weeks others experience more gradual changes as red blood cell levels normalise

10.1159/000337945 [DOI] [PubMed] [Google Scholar] 13
There is no evidence that sublingual administration has any benefits over oral intake, but it may be preferable for people with swallowing problems

It supports nerve function and red blood cell formation
