Mushrooms: A rich source of the antioxidants ergothioneine and glutathione ScienceDirect The nutritional benefit of mushrooms is remarkable. For centuries, mushrooms have been legendary for their nutritional value. But it's only been recently that mushrooms have been studied and their true power revealed. Mushrooms (especially porcini) contain the highest levels of 2 powerful antioxidants, ergothioneine and glutathione, the latter of which is sometimes called the mother of all antioxidants and is a very important bodily Ergothioneine a dietderived antioxidant with therapeutic potential Halliwell 2018 FEBS Letters Wiley Online Library