Hydroxocobalamin Vitamin B12 is used in the treatment and prevention of Vitamin B12 deficiency. The most common cause of vitamin B12 deficiency in the UK is pernicious anaemia (an autoimmune condition that affects your stomach). Vitamin B12 deficiency can also be a side effect of diabetes medicine, particularly if you take a high dose of metformin or if you take it for a long time. Hydroxocobalamin is only available on prescription.
