Ergothioneine is a naturally occurring sulfur-containing amino-acid derivative found in foods such as mushrooms. Research indicates that humans express the OCTN1 transporter, which is associated with ergothioneine uptake and distribution in selected tissues and cells. As an active ingredient for food, dietary supplement, and personal-care formulations, ergothioneine is commonly explored for antioxidant, photoprotection, and skin-condition support applications.






