Translations:Hydroxocobalamin/6/en
| IUPAC_name = Coα-[α-(5,6-dimethylbenzimidazolyl)]-
Coβ-hydroxocobamide
| C=62 | H=89 | Co=1 | N=13 | O=15 | P=1
| smiles = Cc1cc2ncn(c2cc1C)C9OC(CO)C(OP3(=O)OC(C)CNC(=O)CCC5C4=C(C)C8=NC(=CC7=NC(=C(C)C6=NC(C)(C(N4[Co](O)O3)C5(C)CC(N)=O)C(C)(CC(N)=O)C6CCC(N)=O)C(C)(CC(N)=O)C7CCC(N)=O)C(CCC(N)=O)C8(C)C)C9O
| StdInChI_Ref = 
| StdInChI = 1S/C62H90N13O14P.Co.H2O/c1-29-20-40-41(21-30(29)2)75(28-70-40)56-52(84)53(42(27-76)87-56)89-90(85,86)88-31(3)26-69-49(83)19-15-36-50-32(4)54-58(6,7)34(12-16-43(63)77)38(71-54)22-39-35(13-17-44(64)78)59(8,23-46(66)80)55(72-39)33(5)51-37(14-18-45(65)79)61(10,25-48(68)82)62(11,74-51)57(73-50)60(36,9)24-47(67)81;;/h20-22,28,31,34-37,42,52-53,56-57,76,84H,12-19,23-27H2,1-11H3,(H15,63,64,65,66,67,68,69,71,72,73,74,77,78,79,80,81,82,83,85,86);;1H2/q;+3;/p-3
| StdInChIKey_Ref =
| StdInChIKey = GTSMWDDKWYUXGH-UHFFFAOYSA-K
}}
Hydroxocobalamin, also known as vitamin B12a and hydroxycobalamin, is a vitamin found in food and used as a dietary supplement. As a supplement it is used to treat vitamin B12 deficiency including pernicious anemia. Other uses include treatment for cyanide poisoning, Leber's optic atrophy, and toxic amblyopia. It is given by injection into a muscle or vein.