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The optimal administration route in humans has not been definitively established through clinical trials
There are more nerves in the muscle in the thigh than in the deltoid muscle, and it is easier to find the safe place to do the injection in the upper arm (which is why this is a common used place to give vaccinations i.m.)
You might benefit from a B12 shot if you: Follow a vegan or vegetarian diet
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Use QuestDirect or LabCorp OnDemand, or a patient-direct ordering service like Ulta Lab Tests
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