B12 shots have the potential for mild side effects, such as redness where the shot was injected or light diarrhea
Intramuscular hydroxocobalamin injections are the recommended first-line treatment in the UK, as they bypass the absorption problem caused by lack of intrinsic factor
This can be caused by certain factors
The common technique mistakes Most problems trace back to a handful of errors: using the wrong needle length so the dose lands in fat rather than muscle, not cleaning the skin, injecting too fast, injecting at the wrong angle, or reusing a needle
While rarely reported, some people have noticed a headache, slight itching at the injection site, or minor levels of anxiety.
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