The primary reasons people become deficient usually fall into two categories: Dietary Factors: Since B12 is mainly found in animal products (meat, fish, dairy, eggs), vegans and strict vegetarians are particularly susceptible if they dont consume fortified foods or specific supplements
[DOI] [PubMed] [Google Scholar] 122.Klonoff DC, Buse JB, Nielsen LL, et al
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three randomized clinical trials Each of these studies shows that in terms of increasing serum vitamin B oral vitamin B 12 is just as effective as IM B 12 12 levels
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