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Efficacy of different routes of vitamin B12 supplementation for the treatment of patients with vitamin B12 deficiency: A systematic review and network meta-analysis

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While a B12 supplement may not cause harm, Dietary Guidelines for Americans, a government publication that provides nutrition advice to the public, recommends getting most nutrients primarily from food and beverages

[DOI] [PubMed] [Google Scholar] Sterne 2011 Sterne JA, Sutton AJ, Ioannidis JP, Terrin N, Jones DR, Lau J, et al