Abstract Antioxidants are an inhibitor of the process of oxidation, even at relatively small concentration and thus have diverse physiological role in the body. This review is a comprehensive article, which reviews the classification and sources of antioxidants with their biological activities including the mechanism of action. In addition, it gives the most trusted common methods to estimate the activities of antioxidants which are chosen from huge number of methods. The article also reviews the chemical analysis of the most common antioxidant.
Keywords Antioxidants, Synthetic, Natural, Classification, Sources, Biological Activity, Activity Estimation, Chemical Analysis.