US$ 20.03
injection kits for vitamin b12 Cyanocobalamin 1,000 mcg, 25/Box (Rx) — Mountainside Medical (The National Institutes of Health) Aging can make it more difficult for the body to break down and absorb B12 Personalized B12 Injection Kit Bag
Description
PMC8337113

We also searched clinical guidelines and our personal archives of references, and screened the reference lists of studies retrieved by the searches

[18] In addition, choline can donate methyl groups to support methionine regeneration, possibly contributing to their synergistic lipotropic effects

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
