Causes of Vitamin B12 Deficiency Inadequate dietary intake Malabsorption disorders Insufficient stomach acid Surgical procedures Autoimmune conditions Medications Age-related factors Inadequate dietary intake Vitamin B12 is found only in animal products such as eggs, meat, fish, and dairy products, but vegans and vegetarians do not consume animal products, therefore it is easy to develop vitamin B12 deficiency

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J Blood Med (2012) 3:97103.10.2147/JBM.S25620 18 OhRBrownDL
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