b12 injection 76104 Vitamin B-12 Injection, 5,000 mcg/mL, 100 ml 12 deficiency Something BIG is coming… and
Description
Cyanocobalamin costs less than methylcobalamin for oral supplementation
IV administration might be chosen if you are already on IV fluids or need a very rapid correction of vitamin levels

Moreover, comparative investigations often help laboratories establish consistent evaluation standards across multiple projects

Horm Res 48 (Suppl 5): S105S110 Rudling M et al
The proposed chain of effects looks like this: NNMT inhibited nicotinamide is no longer inactivated by methylation and becomes available for conversion to NAD+

Your provider determines the most appropriate formulation for you
