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difference between bac water and sterile water Bacteriostatic vs Bacteriostatic Water vs Sterile Water:
Description
Why is it so important not to shake the vial after adding the water

Arendt J, Nex E (2011) Treatment response in vitamin B12 deficiency depends on the chosen vitamin B12 preparation

It also plays an important part in turning food into energy

Journal of Metabolic Research , 45(3), 217225

Usually caught earlier if a matter of not eating enough B12 and if damage has not already occurred can be rectified swiftly
Per the NIH, "B12 has not been shown to cause any harm, even at high doses." As noted above, it is difficult to overdose on B12
