What is ergothioneine?Ergothioneine (mercaptohistidine trimethyl inner salt, ergothioneine, EGT) is a natural antioxidant that can protect cells in the human body and is an important active substance in the body. Natural antioxidants are safe and non-toxic, and have become a research hotspot. As a natural antioxidant, ergothioneine has entered people's field of vision.