Cyanocobalamin
Cyanocobalamin is a synthetic form of vitamin B12. Vitamin B12 is the “generic descriptor” name for any vitamers of vitamin B12. Because humans and animals can convert cyanocobalamin to any one of the active vitamin B12 compounds, by definition this makes cyanocobalamin itself a form (or vitamer) of B12.
This page uses material from the related Wikipedia article which is released under the Creative Commons Attribution-Share-Alike License 3.0.