Objective:To evaluate the antioxidant activity of aqueous extract of Atoringa oleifeta M.oleifera) young leaves by in vivo as well as in vitro assays.Methods:In vitro study included estimation of total phenolic,total ilavonol,total flavonoid and total antioxidant power(FRAP assay).Tn addition, in vivo study was done with the identified most effective dose of 200 nig/kg of its lyophilized powder on normal and diabetic rats.Its effect on different oxidative free radical scavenging enzymes,viz,superoxide dismutase(SOD),catalase(CAT),glutathione-S-transferase(GST),lipid peroxide(LPO) contents were measured.Results:Significant increase in activities of SOD.CAT, GST while,a decrease in LPO content was observed.Whereas,total phenolic,flavonoid and ilavonol contents in the extract were found to be 120 mg/g of CAK,40.5 mg/g of QEK and 12.12 mg/g of QE,respectively.On the other hand.FRAP assay results of M.oleifera leaves was(85.00±5.00)μM of Fe~+/g of extract powder.Conclusions:The significant antioxidant activities of M.oleifera leaves from both in vivo as well as in vitro studies suggests that the regular intake of its leaves through diet can protect normal as well as diabetic patients against oxidative damage. Objective: To evaluate the antioxidant activity of aqueous extract of Atoringa oleifeta M. oleifera) young leaves by in vivo as well as in vitro assays. Methods: In vitro study included estimation of total phenolic, total ilavonol, total flavonoid and total antioxidant power ( FRAP assay). TN addition, in vivo study was done with the identified most effective dose of 200 nig / kg of its lyophilized powder on normal and diabetic rats. Its effect on different oxidative free radical scavenging enzymes, viz, superoxide dismutase (SOD) Results: Significant increase in activities of SOD.CAT, GST while, a decrease in LPO content was observed. Who exists in the total phenolic content of catalase (CAT), glutathione-S-transferase , flavonoid and ilavonol contents in the extract were found to be 120 mg / g of CAK, 40.5 mg / g of QEK and 12.12 mg / g of QE, respectively. Of the other hand. Frax assay results of M. oleifera leaves was ( 85.00 ± 5.00) μM of Fe ~ + / g of extract powder. Conclusions: The significan t antioxidant activities of M. oleifera leaves from both in vivo as well as in vitro studies suggests that the regular intake of its leaves through diet can protect normal as well as diabetic patients against oxidative damage.