Inclusion criteria will be as follows: Volunteers will be divided into 2 groups: healthy patients and HCV patients not on interferon. Exclusion criteria will be as follows: significantly decompensated liver cirrhosis of Child's Class C, patients with evidence of liver mass or hepatocellular cancer. Patients who are pregnant or on antioxidant such at Vitamin E or Vitamin C will also be excluded. Also patients with known allergy to N-acetylcysteine will be excluded