Hydroxocobalamin
![](/Images/godic/202501/19/Hydroxocobalamin.svg1814.png")
![Hydroxocobalamin at standard conditions is a solid composed of extremely dark red crystals.](/Images/godic/202501/19/HydroxycobalaminSolid1814.JPG")
![Hydroxocobalamin injection USP (1000 mcg/mL) is a clear red liquid solution of hydoxocobalamin which is available in a 30 mL brown glass multidose vial packaged in a paper box. Shown is 500 mcg B-12 (as 1/2 cc) drawn up in a 1/2 cc U-100 27 gauge x 1/2](/Images/godic/202501/19/Hydroxocobalamin_Injection1814.jpg")
Hydroxocobalamin (also hydroxycobalamin, OHCbl, or B12a) is a natural form, or vitamer, of vitamin B12. It is a member of the cobalamin family of compounds. Hydroxocobalamin is produced by many bacteria that are used to produce the vitamin commercially. Like other forms of vitamin B12, hydroxocobalamin has an intense red color. In humans, it is rapidly converted to usable coenzyme forms of vitamin B12. Hydroxocobalamin is used as an injectable solution for treatment of the vitamin deficiency and for treatment for cyanide poisoning. It has been tested as a scavenger of nitric oxide.