What is vitamin B12 and what does it do? Vitamin B12 or Methylcobalamin is a nutrient that the human body needs to make red blood cells, nerves, DNA, and carry out other functions. Methylcobalamin is sometimes used in people with pernicious anemia, diabetes, and other conditions. The average adult needs 2.4 micrograms a day. Like most vitamins, B12 can’t be made by the body and we must get it from food…
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