In this study, the effect of the flavonoids quercetin-3-methyl-ether (isorhamnetin) (1), quercetin-3,7-dimethyl-ether (2) and kaempferol-3,7-dimethyl-ether (3) isolated from Cistus laurifolius L. (cistaceae) leaves was assessed on lipid peroxidation (liver and plasma), cellular glutathione (GSH)