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Vitamins | Vitamin
E | Vitamin D | Vitamin
k
Vitamin b6
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Vitamin A is a fat-soluble vitamin which helps in healthy bone formation and prevents
night-blindness. It occurs only in foods of animal
origin. Vitamin A activity is also processed by carotenoids found in plants. Hence carotenoids are called
pro-vitamin A.
The absorption of vitamins is through lymphatic system and
then into the blood
stream. It is stored in the liver. |
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Types
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Vitamin A2: found in liver of fresh-water fish.
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Vitamin A aldehyde [retinal, retinene]:
found in rods and cones in the retina of the eyes.
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Vitamin A acid [Retinoic acid]
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Function
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- Helps in improving vision even in dim light.
- Prevents keratinisation of epithelial tissues like salivary glands, respiratory
tract, skin, eyes, and sex organs.
- Helps in healthy bone formation.
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Effects of Deficiency
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- Night blindness
- Xerosis conjunctiva
- Xerosis cornea
- Bitot's spots
- Keratomalacia
- Follicular Hyperkeratosis
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Sources
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Source |
Vitamin A content (Mg / 100 g) |
| Rich sources: |
Fish liver oils |
6,660-1000,000 |
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Cod liver oil |
10,000-100,000 |
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Cod liver oil (B.P.) |
18,000 |
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Shark liver oil |
9,000-16,000 |
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Shark liver oil (I.P.) |
6,660 |
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Liver (sheep, goat, ox or pig) |
6,000-10,000 |
| Good sources: |
Butter |
720-1200 |
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Ghee (clarified butter fat) |
600-700 |
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Egg (hen), whole |
300-400 |
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Egg, yolk |
600-800 |
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Milk powder, full cream |
400-450 |
| Fair sources: |
Milk , cow or buffalo (whole) |
50-60 |
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Fatty fish |
30-40 |
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