can i do b12 injections myself How to self-inject intramuscular vitamin - Overview B12 Injections at Home -
Description
The presence of severe joint swelling or unstable joint conditions may also influence treatment decisions

It can cause too much harm related to low B12

References Stier H
Individuals with digestive conditions such as Crohns disease, celiac disease, or those whove undergone certain procedures affecting the stomach or small intestine may struggle with absorption

Annals of the New York Academy of Sciences, 1270, 6672
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What to Expect During Treatment B12 injections are administered directly into the muscle, typically in the arm or thigh