The aim of this study was to examine whether an antioxidant combination of vitamin C, vitamin E, and sodium selenate (Se) has an effect on the liver of diabetic rats. Vitamin C, vitamin E, and Se were administered for 30 days to streptozotocin (STZ)-induced diabetic and control groups. In the STZ diabetic group, blood glucose levels, liver lipid peroxidation (LPO), and nonenzymatic glycosylation (NEG) levels increased, but blood and liver glutathione levels decreased. On the other hand, combined antioxidant treatment reversed these effects. In the diabetic group, some degenerative changes were observed by light and electron microscopic examinations, but the degenerative changes decreased in the diabetic group given antioxidant combination. Proliferating cell nuclear antigen (PCNA) immunohistochemistry showed that the number of proliferative hepatocytes increased significantly with antioxidant treatment. It was concluded that combined treatment with vitamin C, vitamin E, and Se has a curative effect against the hepatotoxicity produced by STZ-induced diabetes.