Essential oil (30 mg/kg body weight) of F. vulgare works in the correction of hyperglycemia from 162.5 ± 3.19 mg/dL to 81.97 ± 1.97 mg/dL with P < 0.05 and the activity of serum glutathione peroxidase from 59.72 ± 2.78 U/g Hb to 99.60 ± 6.38 U/g Hb with P < 0.05. This evidence concerns the gene GSTM1 and Hyperglycemia.