Recommended daily intake= 2.4 mcg

There are no vegan foods contain vitamin B12, only foods fortified with vitamin B12

Deficiency symptoms

  1. megaloblastic anemia
  2. Erythematous Oral Macules
  3. psychiatric illness
  4. severe neurologic sequelae in infants
  5. growth retardation, and infertility.
  6. Excessive Daytime Sleepiness



  1. important for protein metabolism
  2. helps in the formation of red blood cells
  3. maintenance of the central nervous system.
  4. protects cells from oxidative DNA damage
  5. Inflammation reduction
  6. cofactor for several essential enzymatic reactions, including methionine synthesis


Overdose: 0.4-1 mg but does not have any side effects

Excess: excreted in the urine

Type: water soluble vitamin