TUDCA and NAC by ABL PharmaTUDCA and NAC by ABL Pharma TUDCA and NAC by ABL Pharma TUDCA is said to be the king of liver protection. TUDCA is a water soluble bile acid that is naturally present in the human body. N Acetyl cysteine (NAC) is a precursor to glutathione, the body's most powerful antioxidant. TUDCA and NAC have been shown to be effective in protecting the liver from damage caused by a variety of factors, including viral hepatitis C infection (HCV). +[1,2,3] It is