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Vitamin B12 is a vitamin and is essential for your central nervous system, red blood cells, DNA and metabolism

PMID: 4762237 Seiwerth S, et al

What are the signs that indicate a need to adjust vitamin B12 dosing regimens

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Most United States laboratories report a reference range of roughly 160 to 950 pg/mL, though exact figures differ between labs, so a result should be read against the range printed on your own vitamin B12 blood test report