Supplementation with l glutathione improves oxidative status and reduces protein nitration in myenteric neurons in the jejunum in diabetic Rattus norvegicus ScienceDirect Nutritional load in post prandial oxidative stress and the pathogeneses of diabetes mellitus npj Science of Food Effect of glucose on reduced glutathione level in Malay uncomplicated type 2 diabetes patients Acta Biochimica Indonesiana Improved glycemic control either alone, or combined with antioxidant supplementation, fails to restore blood glutathione or markers of oxidative stress in adolescents with poorly controlled type 1 diabetes ScienceDirect