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However, high doses of vitamin B12, such as those used to treat a deficiency, might cause: Headache Nausea and vomiting Diarrhea Fatigue or weakness Its important to note that these side effects are generally mild and temporary
If you have received a coronary stent, you should consult with your clinician before having B12 injections as certain interactions between B12 and other vitamin supplements can increase the risk of blood vessel narrowing
The injection provider can administer the B12 shot deep into the muscle (intramuscularly) or into the tissue layer between the skin and the muscle (subcutaneously)
Hydroxocobalamin is the preferred B12 formulation in the UK due to its longer duration of action compared to cyanocobalamin
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