I receive monthly intramuscular vitamin B12 (cobalamin) injections, but my serum B12 level measured two weeks after the injection is only 268 pg mL; why is it low and how should the dosing Normal B12 Levels (by Age) vs. the Optimal Range PA Relief Vitamin B12 deficiency Wikipedia B12 Injections Reset Lab
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b12 injections not raising levels Vitamin B12 Deficiency – RefHelp