The aim of the study was to assess the efficacy and tolerance of the use of reduced GSH in patients suffering from alcoholic diseases of the liver. Eighty patients were randomly divided into two matched groups and treated for 30 days with 300 mg of reduced GSH or 10 mg of vitamin K. Clinical symptoms and the main indices of hepatic function were assessed before and after treatment. At the end of the study all patients had improved, but the group treated with reduced GSH showed a greater improvement of hepatic function indices (SAT, ALT, gamma-GT) which was statistically significant in comparison to that found in the vitamin K treatment group.