Biochemical parameters, alanine aminotransferase (ALT), aspartate aminotransferase (AST), fasting blood glucose, triglyceride, free fatty acid, hemoglobin-A1c (Hb-A1c), total cholesterol, high-density lipoprotein (HDL)-cholesterol, and low-density lipoprotein (LDL)-cholesterol levels in normal control, streptozotocin (STZ)-induced diabetic group (DC), diabetic rats treated with metformin (D + M), diabetic rats supplemented with RGE (D + RGE), and diabetic rats treated with metformin and RGE (D + RGE + M). Bars represent means ± SD of four rats per group; * p < 0.05 compared with control group using Student’s t-test; + p < 0.05 compared with DC group using Student’s t-test.