Ergothioneine(EGT) is an important active substance in human boday.Ergothioneine is obtained by multi fermentation of Hericium Erinaceum & Tricholoma Matsutake.Multi fermentation can increase the yield of L-Ergothioneine,which is a sulfur-containing derivative of the amino acid histidine,a unique stable antioxidant and cytoprotective agent,existing in the human body.Ergothioneine can be transferred inside mitochondria by the transporter OCTN-1 in skin keratinocytes and fibroblasts,thus playing the anti-oxidation and protection functions there.