Also known as ferment, a sort of exclusive active substance made of amino acids available in living animal and plants to keep human body in normal operation, an indispensable element. A human body cell can contain as many as thousands types of enzyme which, for its uniqueness, each enzyme is responsible for one and unique function. This is why the enzyme in vivo is indispensable. In the human body, these enzymes carry out oxidoreductase, hydrolysis, metastasis and synthesis among others for metabolism that makes human bodies operational. Besides, all physical activities, such as metabolic systems, immune system and digestive system among others do rely on the catalysis by enzyme and we refer this process as catalysis. Without enzyme, there would be no physical activities in human body at all and the 5 Key Nutrients (carbohydrates, lipids, proteins Vitamins and minerals) will soon turn to be useless as all vital phenomena will come to and end.

If human body is an enterprise, the brain would then be the manager and the internal organs the manufacturing plants in different division and cells the operating rooms and nerves work as telephone for communication, blood the transportation means and hormone is just like lubricant to machines and food the raw material and eventually, enzyme the labor involved in all works. If the labor works correctly and rapidly on his duty, we would then be able to expect quality products－ energy that is key to life.