Cyanocobalamin is a manufactured version of vitamin B12 that can only be obtained through supplements, whereas methylcobalamin is a naturally occurring type that may be obtained from either diet or supplements. Cyanocobalamin is used in medicine while methylcobalamin is used primarily as a supplement to help increase levels of methionine in the body. Cyanocobalamin has a molecular weight of 1,108.16. The chemical formula for cyanocobalamin is C60H102N2O5S. It consists of two parts: cyano means "blue" and co-baltuminoide means "vitamin B12". Methylcobalamin has a molecular weight of 1,128.16. The chemical formula for methylcobalamin is C59H104N2O5S. It consists of two parts: methyl means "one-fifth" and cobalamin means "vitamin B12". Vitamin B12 was first discovered by Albert Bender and Edwin Gierer in 1929. They named it "vita niacina" which translates into "niacin (B3) bacteria". Before this discovery, scientists believed that animals were the only organisms capable of making their own vitamin B12.