vitamin b12 injections in alta loma Compounded Cyanocobalamin (Vitamin B12) Injection Vitamin B Vitamin B12 Injections | B12
Description
B12 injections deliver the vitamin directly into the bloodstream, bypassing digestive absorption issues that make oral supplements less effective for many people

Haematologica (2011) 96:28490
I am concerned about both

Not sure it would occur that fast, but they seemed to brush it off so I doubt it would prevent you from getting a second dose, assuming you have educated medical personnel administering the dose and that you did not have anaphylaxis with the first dose

Are Vitamin Shots Right For You
