is it good to take b12 injection Curious about shots? Will my B12 Injection Work

Vitamin B12 is also involved in homocysteine metabolism and is critical in proper energy metabolism, immune function, and nerve function

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

Some GPs don't respond well to finding out their patients are treating themselves

pernicious anemia refers to one of the hematologic manifestations of chronic auto-immune gastritis, in which the immune system targets the parietal cells of the stomach or intrinsic factor itself, leading to decreased absorption of vitamin B 12

That said, it is not FDA-approved, so it should only be considered under licensed medical supervision