Coffee has antioxidant and antifibrotic effects. Caffeine may not be the important component; polyphenols may be more important. Drinking two or more cups of coffee a day is associated with improvements in the liver enzymes ALT, AST, and GGT. Even in those with liver disease, coffee consumption can lower fibrosis and cirrhosis.[110]

Interesting. I would have assumed caffeine was the critical component, and was wondering why they called out coffee, but this all makes sense as to why.