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doi: 10.1074/jbc.M114.612796

May be its not B12 but B6 that is affecting our sleep
Journal of Peptide Research

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If you want to get your B12 from fortified foods rather than take supplements, youd have to eat three separate servings of B12-fortified foods, ideally with each serving containing at least 190 percent of the Daily Value on the products nutrition facts label