Royal jelly supplementation resulted in significant reduction in the mean serum glycosylated hemoglobin levels ( 8.67 % 2.24 % vs. 7.05 % 1.45 % , P = 0.001 ) and significant elevation in the mean insulin concentration ( 70.2829.16 pmol/L vs. 86.4627.50 pmol/L , P = 0.01 ) .