Some research has shown that plasma vitamin E levels are significantly lower in subjects with high blood sugar levels.
Research also suggests that daily supplementation with vitamin E promotes healthy levels of hemoglobin A1c, already within normal ranges.
References:
Peerapatdit T, Patchanans N, Likidlilid A, Poldee S, Sriratanasathavorn C. Plasma lipid peroxidation and antioxidiant nutrients in type 2 diabetic patients. J Med Assoc Thai. 2006;89 Suppl 5:S147-55.
Jain SK, McVie R, Jaramillo JJ, et al. Effect of modest vitamin E supplementation on blood glycated hemoglobin and triglyceride levels and red cell indices in type I diabetic patients. J Am Coll Nutr 1996;15:458-61.
Ceriello A, Giugliano D, Quatraro A, et al. Vitamin E reduction of protein glycosylation in diabetes. New prospect for prevention of diabetic complications? Diabetes Care 1991;14:68–72.
Duntas L, Kemmer TP, Vorberg B, Scherbaum W. Administration of d-alpha-tocopherol in patients with insulin-dependent diabetes mellitus. Curr Ther Res 1996;57:682–90.