how is vitamin b12 injection administered Injections at Home - Safety Guide for Self-Administration How to Give a B12

If you experience any signs of overdose, seek medical attention immediately

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The infusion rate must be controlled to prevent bad reactions

Surely the MHRA can make vital lifesaving B12 injections available over the counter if they want to

1 Asymptomatic autoimmune gastritis likely precedes gastric atrophy by 10 to 20 years, followed by the onset of iron-deficiency anemia that occurs as early as 20 years before vitamin B 12 deficiency pernicious anemia

This means that it is not possible to overdose on vitamin B12, and as far as we know there is no upper limit on the amount of B12 that can be taken safely by an otherwise healthy person