b12 injection given where Best Vitamin Sites: to Inject B12 · PA Relief B12 Injections at Home -
Description
Injection must always follow your markings

Because of this, it has a very high safety profile, and there is no established upper limit for intake

This is an entirely separate regulatory path from drug approval and does not imply it is safe or effective as a therapeutic agent
Practical tip: Avoid prolonged elbow flexion