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However, there is no robust evidence that B12 injections enhance energy, alertness, or performance in individuals whose B12 levels are already adequate

doi: 10.1016/j.ghir.2015.08.007 15 van DijkPRLogtenbergSJChisalitaSIHedmanCAGroenierKHGansROet al
Yukna RA, Krauser JT, Callan DP, Evans GH, Cruz R, Martin M

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