As of 1 April 2026, the PSJD database will become an archive and will no longer accept new data. Current publications from Polish scientific journals are available through the Library of Science: https://bibliotekanauki.pl
Paper describes selenium metabolism and its function in physiological and pathological states. A role of selenium in development of human internal pathology with its action in suppressing the carcinogenesis is outlined. Function of selenium in biochemical structures is showed with a special stress put on glutathione peroxidase.