oxidative stress is an imbalance between free oxygen radicals and antioxidants. what are free oxygen radicals? they means free electrons which were bounded in chemical compound befoe.they cause damage on cell membranes, nucleus and other organels membranes. ıt leads to cell apoptosise. some effects triggers for seperating of bounded electrons like heat, toxins or drugs. we can give example of divorced pairs for this issue. in degenerated societies weakness wedlock permits to many factor to seperate with each other. and after marriage the singles with more energy seeking for a new relationship. most of the time ıt results with a releationship with a married person and this releationship leads to e new divorced person. that reveals to chains of divorced pairs. like in this example, free radicalls cause more free radicals. for preventing oxidative stress some substances referred to antioxidants can be used but true agent for true target is very important.