http://www.heavymetalsymptoms.com/?p=168
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"Micronutrients are nutrients required by humans and other organisms throughout life in small quantities to orchestrate a whole range of physiological functions, but which the organism itself cannot produce.[1] For people, they include dietary trace minerals in amounts generally less than 100 milligrams/day[citation needed] - as opposed to macrominerals which are required in larger quantities.
The microminerals or trace elements include at least iron, cobalt, chromium, copper[2], iodine, manganese, selenium, zinc and molybdenum. Micronutrients also include vitamins, which are organic compounds required as nutrients in tiny amounts by an organism.[3]"