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Vitamin B12 Deficiency and Pernicious Anaemia Pernicious Anemia and B12 Deficiency PlexusDx Vitamin B12 Deficiency Vitamin B12 deficiency happens when the body does not have enough vitamin B12. Vitamin B12 is important for making healthy red blood cells and keeping nerves Pernicious Anemia: Definition, Symptoms, Causes & Treatment
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