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In the present work we studied the changes in some red blood cell antioxidant enzymes which are involved in the organisms antioxidant system after administration of deuterium depleted water (DDW) in rats, during a 60 days experimental period. There was determined that in a short time treatment, DDW had a prooxidant effect (malondialdehide values are increasing) but after a loger time administration, DDW stimulated the cell antioxidant defense system. GSHred (p< 0.001), respectively SOD registered increased values (p< 0.05). This conclusions were revealed by the determination of glutathione average values, glutathione peroxidase, glutathione reductase, catalase and superoxid dismutase activities.