b12 deficiency injections or tablets Vitamin Injection: Energy Boost and Anemia Treatment — Mountainside Medical Vitamin B12 Injections | B12
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TOP References Hamel C, Spry C

It isn't a case of "more is better" once the area is covered, though: there's no evidence that pushing volume higher than what's needed for coverage adds any additional benefit, so there's no reason to aim higher than that

doi: 10.1016/j.cmet.2010.09.004

The peptide contains a disulfide bridge between two cysteine residues, which stabilizes its three-dimensional structure

These should be communicated to the prescriber
MedLine Plus and other sources report that some of the side effects may be severe