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The RDA The recommended dietary allowance (RDA) for vitamin B 12 was last revised by the Food and Nutrition Board (FNB) of the US Institute of Medicine (now the National Academy of Medicine) in 1998 ( Table 1 )

Phase separation due to reduced solubility can occur under certain conditions of shipping or storage (e.g

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Todd, at the University of Cambridge, used the LLD assay to extract the anti-pernicious anemia factor from liver extracts, purify it, and name it vitamin B 12