Can the B12 shot only be given in the arm?

No, the B12 shot is not limited to the arm; it can be administered in several locations, including the thigh and the buttocks. The choice of injection site often depends on the patient's comfort and the healthcare provider's preference. Intramuscular injections are commonly used for B12, and various sites can effectively deliver the vitamin. Always consult with a healthcare professional for the best approach.