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It has a positive effect in preventing many diseases, such as cancer, Parkinsons disease and cardiovascular diseases

A deficiency of Vitamin B12 can lead to advanced anemia where the red cells are fewer in number but are larger than normal (macrocytic)

While there is no exact definition for B12 levels, a normal B12 serum test level is considered around 300-900pg/mL, while deficiency is less than 200 pg/mL

therefore, nutritional deficiency of this vitamin is rare in adults in the absence of malabsorption disorders

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