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Oregon State University: Vitamin B12 has the largest and most complex chemical structure of all the vitamins
PubMed Neelakantan H, Wang HY, Vance V, et al
For someone who was deficient, correcting the deficiency can restore normal energy, which may make it easier to stay active as part of an overall healthy lifestyle
doi:10.5740/jaoacint.18-0045
Presented for research literature review only Brning A et al
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