Vitamin B12 shots need to be injected intramuscular, which means deep in the muscle tissue. The upper arm muscle, buttocks muscle and thigh muscle are some of the places in a human body where B12 can be injected.
Vitamin B12 injections can be used to aid in weight loss. They should be administered at least once a week when on a regular injection schedule. Although the injections can be self-administered, the safest way is to consult a medical professional. Before self-administering a B12 shot, the person must clean the injection area with an alcohol wipe and follow the medical instructions.