The potentially reactive derivatives of oxygen,
attributed as reactive oxygen species (ROS), are
continuously generated inside the human body as a result
of contact with excess of exogenous chemicals in our
ambient environment and/or due to a number of
endogenous metabolic processes involving redox
enzymes. Under normal circumstances, the ROS
generated are detoxified by the antioxidants present in
the body and there is equilibrium between the ROS
generated and the antioxidants present. However, owing
to ROS overproduction and/or inadequate antioxidant
defense, this equilibrium is interfered favoring the ROS
upsurge that terminates in oxidative stress