Must have been a quick search indeed.
Milk thistle has been used for many years to treat liver problems. A few studies:
Canini, F., et al., "Use of Silymarin in the Treatment of Alcoholic Hepatic Steatosis," Clin Ter 114.4 (1985) : 307-14.
Ferenci, P., et al., "Randomized Controlled Trial of Silymarin Treatment in Patients with Cirrhosis of the Liver," J Hepatol 9.1 (1989) : 105-13.
Flora, K., et al., "Milk Thistle (Silybum marianum) for the Therapy of Liver Disease," Am J Gastroenterol 93.2 (1998) : 139-43.
Lang, I., et al., "Hepatoprotective and Immunological Effects of Antioxidant Drugs," Tokai J Exp Clin Med 15.2-3 (1990) : 123-7.
Muzes, G., et al., "Effect of the Bioflavonoid Silymarin on the In Vitro Activity and Expression of Superoxide Dismutases (SOD) Enzyme," Acta Physiol Hung 78.1 (1991) : 3-9.
Skottova, N., and Krecman, V., "Silymarin as a Potential Hypocholesterolaemic Drug," Physiol Res 47.1 (1998) : 1-7.
NAC also has a good track record:
Sen, C.K., et al., "Oxidative Stress After Human Exercise: Effect of N-Acetylcysteine Supplementation," J Appl Physiol 76.6 (1994) : 2570-7.
Unfortunately, I cannot find more studies on this at the moment.
R-ALA is also very good at getting liver values back to normal levels as well. Again, I can't find the studies at the moment unfortunately.