pernicious anemia b12 injections not working Anemia: Genomics and Deficiency What You Need to Know
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Available from: Del Bo C, Riso P, Gardana C, Brusamolino A, Battezzati A, Ciappellano S

Because disorders of the GI tract can interfere with the absorption of B12, the level of this vitamin in the blood is sometimes used as a test of gut health

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