The investigators will evaluate the efficacy of high dose vitamin C in chronic hepatitis patients whose serum liver enzymes are elevated more than upper limit.

The changes of laboratory findings including serum transaminase levels, serum albumin levels, Child-Pugh score, MELD score, and APRI score will be evaluated.

Inclusion Criteria:

1. Chronic hepatitis C patients

   • positive anti-HCV antibody more than 6 months
   • serum alanine aminotransferase 40 - 80 IU/L for more than 6 months
   • not indicated for antiviral therapy with interferon and ribavirin

2. Chronic alcoholic hepatitis

   • significant alcohol drinking history and no other cause of chronic hepatitis
   • serum alanine aminotransferase 40 - 80 IU/L for more than 6 months

Exclusion Criteria:

• Chronic hepatitis B, autoimmune hepatitis, primary biliary cirrhosis, Wilson's disease, hemochromatosis, other chronic hepatitis except chronic hepatitis C or alcoholic hepatitis
• decompensated liver cirrhosis
• platelet < 50,000/uL or white blood cell < 1,500/uL
• need and willing for antiviral therapy
• significant renal dysfunction (GFR < 30 mL/min/kg) or history of renal stone
• hepatotonic drug (i.e. silymarin, garlic oil, aronamin gold) usage within 2 weeks
• pregnancy, lactating woman