how to.give b12 injection Shot: Step-by-Step Guide for Self-Injection Treating Severe Vitamin B12 Deficiency
Description
They certainly expected this criteria to be immutable though

How should reconstituted 5-Amino-1MQ be stored
Each supplier is reviewed for reliability, documentation integrity, and transparency in testing

The NHS treatment page lays it out clearly: Loading phase (no neurological symptoms): 1mg every other day for two weeks, or until symptoms stop improving