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Vitamin B 12 (cobalamin) deficiency is a common cause of macrocytic anemia and has been implicated in a spectrum of neuropsychiatric disorders.The role of B 12 deficiency in hyperhomocysteinemia and the promotion of atherosclerosis is only now being explored.itamin B 12 deficiency, therefore, can lead to increased levels of serum methylmalonic acid. In the second reaction, homocysteine is converted to methionine by using vitamin B 12 and folic acid as cofactors. In this reaction, a deficiency of vitamin B 12 or folic acid may lead to increased homocysteine levels.
Pernicious anaemia is a condition where vitamin B12 cannot be absorbed into your body. It is the most common cause of vitamin B12 deficiency in the UK. Vitamin B12 deficiency can easily be treated by regular injections of vitamin B12.