The most common sites for B12 injections are the deltoid (upper arm), vastus lateralis (outer thigh), ventrogluteal (hip), abdomen, and outer upper arm for subcutaneous injections
Experience a blast of energy and increase your metabolism with a Vitamin B12 shot
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I use 1 ml little vials to inject b-12 because I'm not making enough to suit my body
It is also used to manage vitamin B12 deficiencies resulting from specific surgeries, diseases of the stomach or gut, and any other genetic disorders affecting vitamin B12 metabolism
Clinical Nutrition, 39(5), 1391-1400