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No, in dietary terms it is a mineral.
Mineral!
Magnesium is the fourth most abundant mineral in the body.
Cobalt has the smallest requirement a day for a human, at just 0.0015mg for both men and women. It can be found in fish, nuts and green leafy vegetables.
it is a mineral
Chromium has the smallest daily requirement at 25 mcg for women under 51 and 35 mcg for men under 51. For those over 51, the requirement is 20 mcg for women and 30 mcg for men. For more information about daily requirements visit http://www.supplementquality.com/news/multi_mineral_chart.html
This mineral is olivine: (Mg, Fe)2SiO4.
magnesium
Magnesium
dolomite
iron, magnesium
Magnesium