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Niacin deficiency is generally rare but can occur in cases of alcoholism, prolonged use of certain drugs such as levodopa and ethionamide, and malabsorptive syndromes, such as Crohns disease, major gastrointestinal surgeries or jejunoileitis (, )
A shortage of vitamin B12 in the body can lead to severe health problems
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it takes what it needs to function and simply flushes out any extra
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