GPT and metabolic dysfunction-associated steatotic liver disease: A higher level of oxidative stress was detected in patients with NASH compared to NAFLD and a reduction in the levels of 8-hydroxy-2-deoxyguanosine (8-OHdG) and GGT, as markers of oxidative stress, was highlighted in NASH patients treated with GSH, with a consequent reduction of alanine transaminase (ALT).