Introduction -- Background -- Zinc -- Copper -- Chromium -- Selenium -- Cobalt -- Magnesium -- Manganese -- Vanadium -- Tin -- Nickel -- Cadmium -- Molybdenum -- Lead -- Mercury -- Arsenic -- Boron -- Lithium -- Trace element content of foods -- Trace elements in the feeding of infants and young children -- International support for investigations on trace element deficiency and excess in human disease -- Methodological problems od special importance in trace element studies -- General recommendation -- Annex 1. The joint IAEA/WHO research project on trace elements in relation to cardiovascular diseases -- Annex 2. Trace elements in human and cow's milk