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[B] The following conclusions are supported by fair evidence:
Clinical trials and observational studies of individuals with COPD receiving high antioxidant intake in the form of food or supplements (e.g. vitamin C, vitamin E, beta-carotene, zinc) have not demonstrated a consistent beneficial effect. Some clinical trials report that increased antioxidant intake (e.g. vitamin C, E and/or zinc supplements) result in lower plasma lipid peroxides (e.g. malondialdehyde, thiobarbituric acid). However,