Just click on a letter, and scroll down. Unlike many animals we are unable to manufacture our own vitamins and rely on our diet to supply us with what we need. No single food contains all of the vitamins, and a balanced and varied diet is necessary for an adequate intake. Each of the thirteen vitamins known today has specific functions in the body, which makes every one of them unique and irreplaceable.
Vitamins are essentials for life.
This means that they dissolve in fat and unutilised supplies can be stored in the body. These dissolve in water and cannot be stored in the body, which means we need a regular daily supply from our diet.