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Cells characterized by rapid division (epithelial cells, bone marrow, myeloid cells) appear to have the greatest requirement for cyanocobalamin
There isnt a tolerable upper intake level for vitamin B12, as its considered a vitamin with low levels of toxicity
Read more about food sources of vitamin B12
investigators considered them unrelated to study drug
Published human trials mainly studied oral and intravenous forms, so subcutaneous amounts come from community practice rather than an approved clinical protocol
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