A vitamin B12 injection is a shot of concentrated B12 that is administered directly into the muscle
PubMed Klicek, R., Kolenc, D., Suran, J., Drmic, D., Brcic, L., Aralica, G., Sever, M., Holjevac, J., Radic, B., Turudic, T., Kokot, A., Patrlj, L., Rucman, R., Seiwerth, S., & Sikiric, P
Local injection near injured tendons may provide advantages over systemic administration for these focal injuries
Adults generally require around 1.5 micrograms per day and pregnant or breastfeeding women require up to 2.8 micrograms a day
That direct route is the whole point, and its why a shot outperforms a pill for anyone with absorption challenges