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Using the wrong diluent Plain sterile water lacks the preservative that keeps a reconstituted vial stable for weeks, use bacteriostatic water
But research says that this vitamin definitely helps with a rare genetic disease (Imerslund-Grasbeck disease) that causes a Vitamin B12 deficiency

Incidence and prevalence of autoimmune liver diseases [Norweigan]
It is one option, not a universal answer
