During many hundred years, our foregathers have used various medicinal plants. It is important that we should do research based on scientigic that to abstract biological activity plants that is unknown still now, to seen sharp and harmgul features, to assort with physical and chemical features etc. Historically in the traditional medicine Rhododendron Adamsi.Rуhd, Rhododendron nivale Hook.fwere used as the preparation against different types of irritations as they have certain effects to increase immune, to cure lung desease, to decrease blood pressure. Within the frame of our research we screened the impact of Rhododendron Adamsi.Rуhd, Rhododendron nivale Hook.fonto hepatocyte’s membrane pereoxidation.