Its hard to say, because theres a variety of substances that could cause such side effects to B12 injections
Specifications for purity, identity, bond integrity, and endotoxin are committed in writing before each synthesis run, which keeps release decisions tied to measured chemistry
While most patients tolerate B12 shots well, mild side effects can occasionally occur, including minor pain or redness at the injection site, mild diarrhoea, or, in rare instances, an allergic reaction
You may also develop vitamin B12 deficiency if: Advertisement First, your healthcare provider will complete a thorough physical examination and ask questions about your medical history so they know if youve any other conditions that may increase your risk of vitamin B12 deficiency