Enzymes are proteins which are manufactured by the human body during the process of protein synthesis. They are catalysts that drive every chemical reaction taking place in the human body, and they enable the human body to be built from proteins, carbohydrates, and fats. Enzymes are highly specific in their activity and form an enzyme-substrate complex speeding up processes as they lower the activation energy during a given reaction period. Through genetic engineering and by isolating specific enzymes, it has become possible to harness the power of enzymes.