|Section2= |Section3= | ExternalMSDS = External MSDS from Fisher Scientific }} }} Cyanocobalamin is an especially common "vitamer" (that is, member of a family of vitamins, all of which have some particular nutritional activity in preventing some vitamin deficiency disease) of the B-12 vitamin family. It is the most famous vitamer of the family, because it's chemically the most air-stable, and it's the easiest to crystallize and therefore easiest to purify after it's produced by bacterial ferme… (More on Cyanocobalamin)