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Bioavailability: nearly 100%, bypasses GI absorption entirely Deficiency: first-line for pernicious anemia and malabsorption Dosing: weekly to monthly maintenance Prescription: yes, through Heally At home: yes, after provider guidance Daily tablets or lozenges

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That depth of evidence gives us substantially more confidence in its mechanisms and effects than we can have with newer, less-studied compounds

[DOI] [PMC free article] [PubMed] [Google Scholar] 159.Kamierczak-Baraska J., Boguszewska K., Adamus-Grabicka A., Karwowski B.T