Vitamins -- problems

As per my knowledge ther are few vitamins which i know and their uses too Vit A ..IT is necessary for eyes i.e. your vision, enough amount of vitA helps in curing all problems of eyes. Vit C it helps to maintin the citrus balance in you body which is absolutely necessary Vit D iT helps to strengthen bones and add calcium soucre Vit E it is very necessary for the skin and its nourishment. resti dont know i know ther much more like Vit B12, B5 which r good for hair. But ni dont know uses of few more vitamins which i know