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3D3DBrazil nuts.
Brazil nuts (which are not nuts and don't come primarily from Brazil) have an elemental peculiarity: There are extremely high in selenium, even when growing in soil that is not particularly rich in that element. It is said that a single Brazil nut gives you your daily requirement of selenium (which is admittedly pretty small).
Source: Walmart
Contributor: Theodore Gray
Acquired: 28 February, 2009
Text Updated: 1 March, 2009
Price: $3
Size: 2"
Purity: 0.003%