b12 injection site buttocks be given in the Gluteal Muscle Injection Site: Ventrogluteal

Why should you get B12 injections

AOD-9604 can be administered via subcutaneous injection or orally, depending on the formulation available

Overgrowth of bacteria: Some people develop vitamin B 12 deficiency as a result of conditions that slow the movement of food through the intestines (diabetes, scleroderma, strictures, diverticula), allowing intestinal bacteria to multiply and overgrow in the upper part of the small intestine

General multivitamins typically dont have enough B12, and require an additional supplement.

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One of them is where you come from, and another one is if you require an expert to administer the injection or if you'll do it yourself