What is it with vitimin A,B,C etc

I don't understand it what are they good for like what's vitimin A good for or B C and the rest?
Asked Mar 26, 2012
Vitamins allow you to rationalize that somehow those little colored pills will go down in your stomach and change all that junk food into spinach, broccoli and cauliflower. :-)

Harvard Public Health:
Answered Mar 26, 2012
Oh I didn't know that at all I thought there like good for certain parts of your body like oranges is vitamin C :)

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