When we are young our mothers make us eat a lot of frut and vegetables to gain vitamins. If we get ill that means that our body has vitamins deficiency.
The infographic below depicts the vitamins essential for every body organ and the source how to get them. For example, for good eyes you need vitamin A, for silk skin you have to get daily vitamin C.
The body also needs vitamin C to make collagen, a protein required to help wounds heal. In addition, vitamin C improves the absorption of iron from plant-based foods and helps the immune system work properly to protect the body from disease.
So unless you can eat plenty of fruits and vegetables, you may need to take a dietary supplement of vitamin C to gain all the benefits.
Source: http://qfoodrecipes.com/what-vitamins-are-good-for/
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Good info showing the different vitamins, their function in our bodies and the common sources for them. I have heard it is better to get your vitamins directly from your food than from another source like a multivitamin. This shows you should really eat your veggies.