when to stop vitamin b12 injections do you (cobalamin) in patients with a confirmed deficiency? Sublingual B12 vs. B12 Injections:

High B12 blood serum levels can often mean: The body is having trouble converting, transporting and absorbing vitamin B12 into the cells where it's needed for intracellular and downstream processes The vitamin B12 in your serum is inactive and not able to be utilized You could also have contributing deficiencies in iodine, selenium, molybdenum, and/or B21 And it can also mean that youre getting a form of B12 in your diet (or vitamins) that is not converting well in your body for absorption (likely cyanocobalamin) Ironically, this is called a paradoxical B12 deficiency

Further, factors like age and kidney function can affect B12 excretion and may influence the recommended dosing frequency

Bacteriostatic Water is sterile, non-pyrogenic water that contains 0.9% benzyl alcohol (9mg/mL) added as a bacteriostatic preservative

medRxiv preprint 2025