CAT and heart disorder: At heart diseases, there is an increased generation of reactive oxygen species such as superoxide anion (O2−) and hydroxyl radicals (OH−), and thymol has the ability to remove the damage of ROS, increasing the endogenous antioxidant enzyme activities such as superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GPx), or glutathione-s-transferase (GST).