What does Vitamin B12 do in the body? Vitamin B12 functions in the body in the form of two coenzymes. Vitamin B12 can function in the metabolism of fatty acids, which are used to maintain certain layers of the nerves. It is needed for DNA synthesis particularly in the production of red blood cells, which carry oxygen to the body. It also acts as a carrier of methyl groups used to produce molecules such as creatine, which is necessary for energy reserves in the muscles.
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