The elderly, vegetarians and people with some specific illnesses can suffer from a Vitamin B12 deficiency, and today many foods that form to make the average diet also have too low levels. Problems that can arise through having a vitamin B12 intake that is not high enough include feeling weak, fatigued, paranoid or mentally impaired as well as damaged nerves, pernicious anemia, delirium and CFS (Chronic Fatigue Syndrome).
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