L-Ergothioneine is produced by fermentation (Aspergillus, mushroom cultures) or synthesis.
It delivers a unique antioxidant that is actively transported into cells via a dedicated transporter (OCTN1) and accumulates in mitochondria, erythrocytes and skin. It scavenges reactive oxygen species, protects cellular DNA, and is studied for longevity, cognitive health, skin protection and oxidative-stress-related conditions.