two types of b12 injections Vitamin Forms The Truth About B12 Injections:
Description
And this can only happen when there's adequate acid production in the stomach, which as we get older, tends to be a problem since acid levels decrease with age

Case reports have documented instances of anaphylactic reactions in patients following their second dose of intramuscular cyanocobalamin, highlighting the need for healthcare providers to be vigilant when administering these injections [1][3]

Abdomen or thigh

Part of the Metabolism & Growth Family