Vitamin B12 Injections: How They Work Vitamin B12 injections are typically administered through a shot, usually into the muscle, although they can also be given subcutaneously (under the skin)
Another B12 shot side effect is diarrhea, though its usually pretty mild
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[113] Currently, radioisotope dilution assay (RIDA) with labeled vitamin B 12 and hog IF (pigs) have been used to determine vitamin B 12 content in food
According to the National Heart, Lung, and Blood Institute, this absorption failure makes B12 injections the primary and most effective treatment, as they deliver the nutrient directly where your body can use it, bypassing the digestive system entirely
Avoid alcohol for 48 hours after your treatment