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People with B12 levels below 200 pg/mL are called B12 deficient and are likely to have symptoms - this could be due to medicines, strict vegetarian diets, or medical conditions

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Antioxid Redox Signal 11:271739 Chang HL, Dedon PC, Deen WM (2008) Kinetic analysis of intracellular concentrations of reactive nitrogen species

Individuals with conditions that affect B12 absorption, such as pernicious anemia or gastrointestinal disorders like Crohns disease or celiac disease, can particularly benefit from B12 injections to maintain healthy red blood cell levels