Cyanocobalamin, vitamin B12 preparations containing benzyl alcohol should be avoided in premature neonates because benzyl alcohol has been associated with gasping syndrome, a potentially fatal condition characterized by metabolic acidosis and CNS, respiratory, circulatory, and renal dysfunction
Patients should not take supplements without professional advice
Maintenance therapy usually involves injections every two to three months
University of Maryland Medical Center Burns
It may be difficult to determine the exact time when your vitamin B12 injections have started working, as many people will report noticing a difference in their energy levels within a few days following the shot, and others may not feel the increase in energy for multiple weeks if their body needs the vitamin to build up a bit more
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