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Specialised treatment based on cognitive behaviour therapy versus usual care for tinnitus: A randomised controlled trial

Your body uses B12 as a cofactor in DNA synthesis, fatty acid metabolism, and homocysteine regulation

Jan 11 2021;14(1)doi:10.1136/bcr-2020-240095 Psillas G, Antoniades E, Ieridou F, Constantinidis J

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
