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Shiitake Mushrooms Found to be Top Food Source of Potent AntioxidantL-ergothioneine, a powerful antioxidant, has been discovered in mushrooms, thanks to a new analytical method capable of identifying this antioxidant in plant material. In research presented at the 2005 American Chemical Society meeting in Washington, D.C., an American research team revealed that mushrooms contain higher concentrations L-ergothioneine than either of the two dietary sources previously believed to contain the most: chicken liver and wheat germ. Testing mushrooms consumed in the U.S., the team found that shiitake, oyster, king oyster and maitake mushrooms contain the highest amounts of ergothioneine, with up to 13 mg in a 3-ounce serving. This equals forty times as much as is found in wheat germ. Of the most commonly consumed mushrooms, portabellas and criminis have the most L-ergothioneine, followed by white buttons. White buttons, the most popular of all mushrooms consumed in the U.S., contain up to 5 mg