Ergothioneine in Lion's Mane

Ergothioneine is a natural substance found in mushrooms that is able to pass the blood brain barrier and contains significant antioxidant and anti-inflammatory properties.

"Lion's mane and oyster mushrooms had the highest concentrations of L-ergothioneine."

Metabolomics Profiling of White Button, Crimini, Portabella, Lion's Mane, Maitake, Oyster, and Shiitake Mushrooms Using Untargeted Metabolomics and Targeted Amino Acid Analysis - PubMed