Fat-soluble vitamins:

1) Vitamin A (Retinol)

Sources: liver, fish oil, eggs, milk, butter, yellow and green vegetables.

Functions:

i) It is a component of the retina, pigments essential for vision. It promotes the normal growth of bones, and teeth and is essential for the growth of epithelial tissue.

Its deficiency causes xerophthalmia in which the cornea becomes bright and thick. Its deficiency causes night blindness in which retinal pigment is not formed.

2. Vitamin D( Calciferol)

Sources: liver oil, ultraviolet light, milk, etc.

Functions:

i) It promotes calcium absorption from the digestion tract. It is essential for normal growth and maintenance of bones.

Its deficiency causes rickets in children in which bones become thin, soft, and weak long bones bent. Its deficiency also causes osteomalacia in adults in which the vertebral becomes weak and pelvic bent.

3. Vitamin E (tocopherol)/ beauty vitamins

Sources:

Vegetable oils, fish, meat, green vegetables.

Functions:

i) It inhibits the oxidation of unsaturated fatty acids. It maintains fertility and normal membrane structure also called beauty vitamin.

Its deficiency causes reproductive failure, prevents normal growth of skin, and increases the breakdown of unsaturated fatty acids.

4. Vitamin k( Phylloquinone)

Sources: Green leafyvegetablese and normally supplied by intestinal bacteria.

Function:

i) It helps in the n formation of prothrombin in the liver. It is necessary for the clotting of blood.