The invention relates to the pharmaceutical industry and to medicine, in particular to a novel highly active antioxidant which is used for preventing and treating diseases caused by oxidative stress and scarcity of oxygen in an organism and which is embodied in the form of a complex of a metal cation selected form an iron, copper, zinc and manganese group with ratio and cevitamic acid and/or dihydrocevitamic acid of general formula (I): e m Ru(AA) r (DGAA) p X n .(I). A method for producing a granulate containing said complex and the tableted and encapsulated form based thereon are also disclosed.
