What Are Vitamins?
Vitamins are essential to life, they are catalyst (activators) in the chemical reactions that are continually taking place within the body.
Of the major vitamins, some are water soluble and some are oil soluble. Water-soluble vitamins must be taken into the body daily, as they cannot be stored and are extracted within four hours to one day. These include vitamin C and the B-Complex vitamins. Oil soluble vitamins can be stored for longer periods of time in the body's fatty tissue and the liver. These include vitamin A, D, E, and K. Both types of vitamins are needed by the body for proper functioning.
These information has been taken from this highly recommended book:
Prescription for Nutritional Healing, Third Edition
By : Phyllis A. Balch, CNC and James F. Balch, M.D.