With a few exceptions like vitamin D, body cannot generate vitamins and thus must be obtained from food or supplements. The absence or improper absorption results in specific deficiency diseases. Also a normal person can have marginal deficiency of vitamins without knowing it and it can be observed only when the symptoms occurs.

Each of the essential vitamins has a specific function in the body. They are responsible for good health and vitality, energy, growth and longevity. To get more information on various functions of common vitamins, their deficiency symptoms, natural sources, daily requirements, and their therapeutic uses click on the links.

Without all the essential vitamins, life cannot be sustained.