This document comprises a review of data of effects of magnetic field exposure on biological systems, pertinent to the evaluation of health risks for man. The purpose of the document is to provide an overview of the known biological effects of magnetic fields, to identify gaps in this knowledge so that direction for further research can be given, and to provide information for health authorities and regulatory agencies on the possible effects of magnetic-field exposure on human health, so that guidance can be given on the assessment of risks from occupational and general population exposure.