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Niacin (Vitamin B3)

By Mark Cichocki, R.N., About.com

Updated: December 21, 2004

About.com Health's Disease and Condition content is reviewed by the Medical Review Board

Functions:

  • energy metabolism
  • healthy skin, digestive system and nervous system
Sources:

  • meat
  • milk
  • eggs
  • poultry
  • fish
  • whole grains
  • enriched bread and cereal
  • nuts
Deficiency (Not enough):

  • weakness
  • dizziness
  • loss of appetite
  • confusion
  • diarrhea
  • rash
Toxicity (Too much):

  • swollen tongue
  • rash
  • low blood pressure
  • nausea / vomiting / diarrhea
Daily Allowances:

  • 100mg
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