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If any of that happens, you need to get medical help right away
[3] Heffernan M, et al
PMC 4575440
NAD precursors (nicotinamide riboside, nicotinamide mononucleotide) work by directly supplying building blocks for NAD synthesis
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
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