Translations:Vitamin B12/1/en

This page is about the family of vitamers. For individual forms, see hydroxocobalamin, cyanocobalamin, methylcobalamin, and adenosylcobalamin.

{{Infobox drug | image = Cobalamin skeletal.svg | width = 200 | caption = General skeletal formula of cobalamins | image2 = Cyanocobalamin-from-xtal-3D-st-noH.png | width2 = | alt2 = | caption2 = Stick model of cyanocobalamin (R = CN) based on the crystal structure