... NIACIN (Nicotinic Acid, Niacinamide, or Vitamin B3) is a B-vitamin that occurs naturally in foods, such as meat, fish, milk, eggs, green vegetables, and enriched cereal grains. Proper amounts of niacin are normally obtained in our diets daily. Niacin supplements are occasionally prescribed to treat pellagra, a serious but rare niacin-deficiency disorder. Pellagra causes skin rashes, diarrhea, and mental disorders. Generic niacin injections are available. Niacin injections are only used when people cannot take niacin by mouth. ...
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