These must be produced by the body itself in order to be effective. We simply need to consume enough fish, meat, eggs and dairy products to provide the body with the raw materials, and the body will do the rest.
另一種是以「蛋白質」為主要成份的抗氧化酵素，必須由人體自行合成才有效，只要我們多吃魚、肉、蛋、奶類等食物，蛋白質供應充足，身體就會自行合成。