how often to give b12 injections Injections: Who Should Get Them and Long Do They Last? B12 Injection Dosage and Frequency:

While many who are deficient opt for oral, over-the-counter supplements, we recommend approaching the deficiency head-on with B12 injections

Note that no dosage adjustment is necessary for kidney insufficiency patients who take Trulicity

[153] There is evidence that for elderly people, physicians often repeatedly prescribe and administer cyanocobalamin injections inappropriately, evidenced by the majority of subjects in one large study either having had normal serum concentrations or having not been tested before the injections

[16] Cyanocobalamin is also produced in the body (and then excreted via urine) after intravenous hydroxycobalamin is used to treat cyanide poisoning

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