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Description
doi: 10.2337/diabetes.47.9.1464

Deficiencies of B12 can manifest themselves as various symptoms

rodentium colonization, reduced survival, and increased mucosal damage in the infected cyanocobalamin-treated mice

As one review paper notes, even the governmental agencies responsible for defining dietary recommendations acknowledge that the benefits of micronutrient consumption may continue on a continuum well above the RDA
