What is vitamin B12? Vitamin B12, also called cobalamin, is a water-soluble vitamin that’s essential to red blood cell production, healthy brain and nerve function, as well DNA synthesis. Even a mild vitamin B12 deficiency can result in impaired mental function and low energy. Vitamin B12 also plays a role in the formation of red blood cells, so a deficiency can lead to the production of large, immature cells that are unable to properly carry oxygen.
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