Selenium content in plant-based foods varies according to the amount of selenium in the soil where they were grown. Common sources for Americans include grains, bread, fish, eggs, poultry, and a variety of meats. The richest sources of selenium overall are seafood, organ meats, and brazil nuts. The latter contain up to 544 micrograms of selenium per ounce, which means one nut could be higher than the entire RDA for an average adult.

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