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B12 may refer to:
  • Vitamin B, a water-soluble vitamin with a key role in the normal functioning of the brain and nervous system, and for the formation of blood
B12 or B-12 may also refer to:

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A deficiency in vitamin B-12 may lead to low counts of red blood cells and, consequently low hemoglobin levels. So, if you are anemic, you may want to be taking vitamin B-12 in addition to iron supplements. Deficiency in B-12 may also lead to fatigue and poor immunity.

Contributed by Laura Daggett

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