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Because of anaphylaxis risk, intravenous B-12 administration is never recommended -intramuscular injection is the safe route
An online vial gives you a powder and a guess
10.1016/j.addr.2018.04.008 96 SchillerH
By delivering B12 through a simple injection, we bypass the digestive system entirelyallowing your body to absorb more of the nutrient, faster
Plant foods contain effectively zero bioavailable B12, so endurance athletes on vegetarian or vegan diets are at elevated risk
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
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