b12 injections morning or night Vitamin B12: Symptoms, Dosage & Toxicity Risks Sublingual B12 vs. B12 Injections:

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There is also recent data which suggest that genetic alterations of the receptor by which B12 is transported into nerve tissue and the brain, may lead to a lower B12 uptake

You should also inform your doctor right away in case you encounter any of the following serious side effects

[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