Research is devoted to the study of the feasibility of using a natural antioxidant of plant origin as a biologically active additive to the basic diet and assessing the effectiveness of its use to increase the meat productivity of broiler chickens. In our work we examined the broiler chickens productivity and quality when using the drug ‘Dihydroquercetin’ (LLC’Kakhor’, Zima, Irkutsk region, Russia) in diets and established the amount of feed consumed and its costs per unit of production. Based on the studies, the addition of the preparation enables to increase the safety of broiler chickens by 20…30%, live mass - by 12…33%, mass of ripped carcass - by 15…38%, muscle tissue - by 3%, thoracic muscles - by 0.3…2%, and edible parts of carcass -by 2…6%. Moreover, the additive reduces the feed consumption by a head during the fattening period by an average of 46.09 g compared to the control.