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All findings referenced are from preclinical research and in vitro studies

Because of anaphylaxis risk, intravenous B-12 administration is never recommended -intramuscular injection is the safe route

For systemic effects, the abdomen is standard

Think of it as the labor code for the nurse or medical assistant who draws up the medication, prepares the injection site, administers the subcutaneous injection, and monitors the patient briefly afterward

Your body does not make vitamin B12 on its own, so you must consume food and drinks that have vitamin B12 to receive it

Plant foods contain effectively zero bioavailable B12, so endurance athletes on vegetarian or vegan diets are at elevated risk