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The vitamins help in the following thing:
vitamin a-good vision ,healthy immune system,cell growth
vitamin d-absorb minerals important for bones
vitamin k- helps in blood clot, prevents excessive bleeding. 
hope it helps

Vitamin a-good for
                      Healthy skin
Beta carotene is a powerful anti oxident which helps in heeling or repairing molecules that damage healthy cells, increases the risk of accelerating the aging process of health conditions.

Important functins of vitamin -d
 To maintain normal blood levels of calcium and phosphorus.
It also sbsorbs calcium and helps to maintain strong bones and teeth.

  Important functions of vitamin-e
It prevents from diseases 
 It's work as an anti oxidant which prevents us from scavanging looses electrons,so it is called free radicals which can damage cells

  Importatance of vitamin k

is necessary for normal blood clotting and synthesis of proteins found in plasma, bone, and kidneys.
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