Vitamins are actively involved in many metabolic processes of the nervous system. Their deficit may cause severe and, sometimes, irreversible consequences. Mechanisms of the therapeutic effects of the vitamin B complex neurobion are considered. Results of the studies on the efficacy and safety of neurobion in patients with polyneuropathies, including those caused by diabetes mellitus, pain syndromes of origin (skeletal/muscle pain, trauma etc) are presented. The necessity of using neurobion in treatment of a wide spectrum of nervous system diseases is emphasized.