Functions
- essential for metabolism of tryptophan
- needed for utilization of certain other amino acids
- aids in red blood cell formation
- aids in nervous system function
- health of skin
Deficiency
- dermatitis around eyes and mouth
- neuritis
- anorexia
- nausea and vomiting
Characteristics
- soluble in water and alcohol
- rapidly inactivated in presence of heat, sunlight, or air
Good Sources
Natural
- meat, fish
- whole grains
- beans
- nuts
- banana
|
Food |
Quantity |
mg |
|
Oat bran muffin |
1 medium |
0.22 |
|
Lima beans, cooked |
1 cup |
0.14 |
|
Tuna, cooked |
3 oz |
0.45 |
|
Banana |
1 medium |
0.68 |
Artificial
- wheat germ
- blackstrap molasses
Recommended Daily Allowances (RDA)
- Males (11 yrs. and older)
- Females (11 yrs. and older)
- Pregnant females
- Lactating females
- Children
- Infants
- Varied values reflect different references
Tolerable Upper Intake Levels (UL)
Intakes above UL may lead to negative health consequences.
Supplementation
- Large doses can cause numbness and other neurological disorders
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