Cosmate®EGT,Ergothioneine (EGT),as a kind of rare amino acid, can be initially found in mushrooms and cyanobacteria,Ergothioneine is a unique sulfur containing amino acid that cannot be synthesized by human and is only available from certain dietary sources,Ergothioneine is a naturally occurring amino acid that is synthesized exclusively by fungi, mycobacteria and cyanobacteria.