Diabetes mellitus is a heterogeneous metabolic disorder with different etiologies. It is characterized by disarrangements in carbohydrates, proteins and fat metabolism caused by the complete or relative deficit of insulin secretion and /or insulin action. During diabetes
mellitus stable hyperglycemia causes an increased production of free radicals via autoxidation of glucose and non enzymatic protein glycation, which leads to the disruption of cellular functions and oxidative damage to the membranes. Oxidative stress is defined as the disturbance
in the balance of homeostatic rate between the production of reactive oxygen species (free radicals) and antioxidant defense mechanism, which may lead to tissue injury[1]. Free
radicals play an important role in causation of diabetes. Antioxidants are the molecules wrestle against free radicals such as superoxide, hydroxyl radicals, peroxyl radicals,singlet oxygen and peroxynitrite, which leads to oxidative stress and thereby to cell damage. If antioxidant defense system is not sufficient against the formed free radicals then damage may occur in a variety of tissues. Hence, these antioxidants can scavenge most of the free radicals have a
vast importance in the enhancement of the recovery from the diseased condition.