Ergothioneine 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 hot research topic. Ergothioneine, as a natural antioxidant, has entered people's field of vision. It has many physiological functions such as scavenging free radicals, detoxifying, maintaining DNA biosynthesis, normal cell growth and cellular immunity.