VITAMINS : 

Vitamins are composed which are essential to life , health , and growth; they are concerned with well- being of body metabolism . these compound , classified according to the solubility as fat - soluble and water - soluble vitamins , are normally absorbed in the small intestine.

FAT-SOLUBLE VITAMINS : 

fat - soluble include A , D , E and K . Vitamin A is found in fish - liver oils , milk , and diary produce, liver and certainly fatty fish . it is growth-promoting and anti-infective. 

carotene , a precursor of vitamin A ,is found in leafy vegetables , carrots , and in some fruits. it converted to A in the body.

deficiency leads to epithelial degeneration and predisposes to infection ,causes night blindness and a diseases of the eyes known as xerophthalmia.

vitamin D is produced by the action of ultraviolet light on ergosterol, and D3 , the natural vitamin D ,produced in the body by exposed of the skin to sunlight or ultraviolet rays .these vitamins are found in fish-liver oils, egg ;butter and fatty fish.

D is essential for the growth of bone and teeth as it promotes calcium absorption. it is the anti-rachitic vitamin.

Deficiency causes rickets in infants and children, and osteo -malacia in adults.

Vitamin E is found in wheat germ oil, egg-yolk, milk, and some green vegetables. it is described as the anti-sterility vitamin, but little is known of this function in man.

vitamin K is found in alfalfa, spinach ,soya bean and pigs liver .it is required  for the formation of prothrombin . insufficient results in prolonged clotting time in in some haemorrhagic diseases of the newly born and when there is bile in the blood as in obstructive jaundice.

WATER - SOLUBLE VITAMINS :

water - soluble vitamins include vitamin B1, the B-complex, vitamin C ans P.

vitamin C is the anti-scorbutic vitamin.it is found in many fruits, particularly the citrus fruits and blackcurrants, rose hips and in vegetables .it is essential for the healthy development of all connective tissues.it raises immunity to infection and assists in the healing of wounds and fractures . deficiency causes scurvy.

vitamin P (hesperidin) is found in citrus fruits , blackcurrants ,rose hips and green leaves . it aids in maintaining normal capillary resistance. insufficiency may result in subcutaneous bleedings.

Vitamin B-complex contains the following, and all are essential to good health:

Aneurin or B1( Thiamine ) is found in whole grain, pulses, pig's liver, eggs and yeast.it is the anti-beri-beri vitamin, essential for the metabolism of carbohydrate. 

Riboflavin or B2 is found in wheat germ, milk,   liver, soyabean, peas, and lentils. Deficiency causes dermantitis and cracks and fissures about the lips and nose.

Nicotinic acid ( Niacin ) is found in lean meat, liver, wheat germ, green vegetables. it is the P.P factor or anti-pellagra vitamin.

Vitamin B12 is found in liver. it is used in the treatment of pernicious anaemia. 

Other vitamins of the B-complex include choline, Pantothenic acid, Folic acid, and Para-amino Benzoic acid.

Pyridoxine (Vitamin B6) is found in green leaves, yeast, liver and kidney.  it is concerned with the formation of normal red blood cells.