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The radioprotective effect of the Aloe vera leaf extract was studied in Swiss albino mice against radiation-induced changes in the liver. The mice were treated with 1000 mg/kg of body weight orally, once a day for 15 consecutive days, before exposure to a single dose of gamma radiation (6 Gy), half an hour after the last administration. The irradiation of mice caused a significant elevation in lipid peroxidation followed by a decrease in glutathione, acid phosphatase and alkaline phosphatase. The treatment of mice before irradiation elevated the glutathione, acid phosphatase and alkaline phosphatase, and was accompanied by a decline in lipid peroxidation. Recovery and regeneration from radiation damage were faster in pretreated animals than the animals in the irradiation-only group. The data clearly indicate that the Aloe vera leaf extract significantly reduced the deleterious effects of radiation on the liver and it could be a useful agent in reducing the side effects of therapeutic radiation.