glutathione peroxidase type 2 Research progress of family (GPX) in redoxidation Glutathione peroxidase 2 | Abcam
Description
doi: 10.3389/fimmu.2022.934695 77 RothhammerV.MascanfroniI

Chitin is a fibrous polysaccharide, and human digestive enzymes have a hard time breaking it down when mushrooms are raw

But its not just about availability, either

Glutathione is naturally present throughout the body, including within the gastrointestinal system, and plays a role in maintaining normal cellular and antioxidant processes