CAT and chronic rhinosinusitis with nasal polyps: Although we have enough information about the antioxidant effects of zinc, it is necessary to investigate various biomarkers related to antioxidant defense in CRSwNP patients, such as superoxide dismutase, catalase, glutathione peroxidase, and glutathione reductase; as in the present study, it was confirmed that the levels of zinc in this particular population were lower.