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[DOI] [PMC free article] [PubMed] [Google Scholar] 90.Kahsai AW, Xiao K, Rajagopal S, Ahn S, Shukla AK, Sun J, Oas TG, Lefkowitz RJ

It is an important part of the neuronal phospholipid bilayer which functions for signal transduction and methylation of DNA, histones and neurons

There are also under the tongue and intranasal methods that can be used once B12 levels are normalized

As a medical device, it is FDA approved but hasnt been tested like pharmaceuticals would be to the highest level of medical evidence and scrutiny

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