Vitamins are necessary, and are required to perform a variety of life-giving functions. It must be remembered that vitamins can only perform...

It really sounds like this question is asking for confirmation about the importance of vitamins.  Yes, vitamins are important for overall physical health.  The reasons that are stated above are correct, but I would like to clarify the second bullet a bit.  It is true that your body needs vitamins in small amounts, but there are two broad categories of vitamins that will affect a person's intake of certain vitamins.  Some vitamins are fat soluble and some are water soluble.  In simple terms, if your body takes in more fat soluble vitamins than necessary, the body will store the excess vitamins in fat tissue.  Water soluble vitamins are not stored by the body.  They are used by the body.  Excess water soluble vitamins will be filtered out of the body.  There is a danger with consuming too much fat soluble vitamin content.  Because the body stores those vitamins, a massive build up can actually lead to toxicity within the body. So while vitamins are important to overall health, their intake needs to be balanced in the same way that a healthy diet is balanced.