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Vitamin B12 molecules, illustration
Illustration of vitamin B12 molecules in a blood vessel. This is methylcobalamin, the active form of the vitamin that is used in dietary supplements. Humans are unable to produce vitamin B12 and so must obtain it from their diet, it is found in meat, poultry, fish and dairy products. It is needed for the production of red blood cells and for a healthy nervous system., by NEMES LASZLO/SCIENCE PHOTO LIBRARY
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