ERGOTHIONEINE, The Super-Antioxidant. To our knowledge, OXIS remains the only significant commercial source of pure l-ergothioneine worldwide using our patented synthetic manufacturing process. L-ergothioneine is a natural antioxidant amino acid normally found in high concentrations in tissues of the body exposed to high levels of oxidative stress (free-radical damage). Humans and other animals cannot synthesize l-ergothioneine (as is also true for the so-called essential amino acids) therefore we have to obtain it from our diet. An extensive compound monograph has been generated that includes an overview of available data. Learn More…..