You should start to see improvements within a few days to a week, however if you do not feel the effects after 2-3 injection sessions, then it is likely that you were and are not deficient in B12
Federal law does not automatically require a prescription for standalone purchases
Jwiak-Bbenista M, Kowalczyk E
It may be difficult to determine the exact time when your vitamin B12 injections have started working, as many people will report noticing a difference in their energy levels within a few days following the shot, and others may not feel the increase in energy for multiple weeks if their body needs the vitamin to build up a bit more
If youre drawn to peptides because of a specific injury, chronic inflammation or a documented health issue, thats a conversation worth having directly with a physician who can evaluate your actual case, not a general wellness trend to opt into on your own