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Vitamin B12

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:

  • helps form new cells
  • helps support a healthy nervous system
Sources:

  • meat
  • poultry
  • fish
  • eggs
  • milk
  • cheese
Deficiency (Not enough):

  • anemia
  • fatigue
Toxicity (Too much):

  • no toxic side effects
Daily Allowances:

  • 300mcg
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