where does the vitamin b12 injection go How to Give Injections at Home to Yourself · PA Relief How to Self-Inject Vitamin B12
Description
Transdermal forms of vitamin B 12 are available over the counter, but this route of administration has not been validated clinically in the setting of vitamin B 12 deficiency and should not be relied upon for treatment

No, this isnt necessary as you cannot overdose on vitamin b12, the body will store what it needs and get rid of the rest

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[5] Nevertheless, any signs of hypersensitivity (such as a diffuse rash, wheezing, or feeling of throat tightness) warrant stopping the injection and seeking prompt medical care

Reference MedlinePlus Cyanocobalamin Injection: Drug Information

So, there are only a few studies aimed at determining the beneficial properties of the modified analogues of BPC 157 [31]