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[91] Since only bacteria and some archea possess the genes and enzymes necessary to synthesize vitamin B 12 , plant and algae sources all obtain the vitamin secondarily from symbiosis with various species of bacteria, [5] or in the case of fermented plant foods, from bacterial fermentation

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By optimizing energy production and supporting metabolic function, B12 injections can help individuals feel more energized and active, which may make it easier to engage in physical exercise and burn calories

[DOI] [PubMed] [Google Scholar] 160.Marsh DJ, Weingarth DT, Novi DE, et al