how quickly does a vitamin b12 injection work Shots at Home: How, Where & Often to Inject Yourself Vitamin B12 Injections: Good or
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V., Vik, A
These shots are administered via intramuscular injection (often referred to as IM) so there is no gastrointestinal metabolism, which also allows for increased nutritional absorption

For treating confirmed B12 deficiency requiring injections, the NHS standard treatment is intramuscular hydroxocobalamin (another form of B12), not methylcobalamin or cyanocobalamin
Preclinical safety data In mouse studies, 5-amino-1mq was well-tolerated even at doses several times higher than those producing metabolic effects

How long until I feel the energy boost from a B12 injection

Chen Y, Lewis W, Diwan A, Cheng EH, Matkovich SJ, Dorn GW