Currently, biologically active substances of natural origin are widely used as preventative agents. The search and development of new drugs for the prevention and correction of nonspecific disorders of the body’s resistance to adverse effects in environment continues. A preclinic assessment of the effectiveness of polyprenols from Siberian fir Abies sibirica was carried out when used prophylactically for two weeks. It has been shown that the effect of polyprenols is manifested by antioxidant, anabolic activity and stimulation of hematopoiesis in an experimental model of combined poisoning with carbendazim and X-ray irradiation.