Ergothioneine for cognitive health, longevity and healthy ageing: where are we now? Proceedings of the Nutrition Society Cambridge Core Ergothioneine: The Elusive Amino Acid reishi and roses In a study, researchers found that mushrooms have high amounts of the ergothioneine and glutathione, both important antioxidants, said the senior author. The researchers also found that the amounts the two compounds RESEARCH: Mushrooms are Disease Fighting Stars Blue Zones