If you are having private injections on top of an NHS schedule, the combined frequency may be higher than either provider realises, which is worth flagging to both
Vitamin B12 Shots vs B12 Supplements When it comes to boosting your Vitamin B12 levels, both supplements and shots can be effective, but there are some differences to consider
severe infections or sepsis, irregular blood vessel surface (vasculitis, artificial heart valve), or, rarely, disseminated intravascular coagulation or DIC (a serious complication of overwhelming infections, traumas, burns, or pregnancy)
These injections are given into the muscle, allowing your body to more fully absorb the nutrients than it would be able to take these supplements orally with pills or powder
& Okawa, M