ALA is a very versatile (water soluble and fat soluble) antioxidant. Studies have shown it's protective effects on the liver, and actually found more effetive than silymarin (milk thistle). In certain cases of toxicity, hospitals will administer ALA intravenously. Here's one study showing the efficacy of ALA administered orally on hepatotoxicity...
Protective effect of alpha-lipoic acid against chloroquine-induced hepatotoxicity in rats.
Pari L, Murugavel P.
Department of Biochemistry, Faculty of Science, Annamalai University, Annamalai Nagar, Tamil Nadu 608 002, India.
Oral administration of a-lipoic acid, a metavitamin, was investigated for its possible hepatoprotective effect in Wistar rats against chloroquine-induced toxicity. Rats were treated orally with alpha-lipoic acid (10, 30 and 100 mg x kg(-1) day(-1)) for 7 days before a single oral administration of chloroquine (970 mg x kg(-1) day(-1)) and alpha-lipoic acid treatment was continued for three more days. The increased level of serum enzymes (aspartate transaminase, alanine transaminase and alkaline phosphatase), bilirubin, lipids and plasma thiobarbituric acid-reactive substances (TBARS) and hydroperoxides observed in rats treated with chloroquine were very much reduced in rats treated with alpha-lipoic acid plus chloroquine. A significant decrease in plasma antioxidants such as reduced glutathione (GSH), vitamin C and vitamin E were observed in chloroquine-treated rats when compared with control rats. Administration of alpha-lipoic acid significantly improved the levels of plasma antioxidants GSH, vitamin C and vitamin E in chloroquine-treated rats. In the case of 100 mg x kg(-1) day(-1) the effect was highly significant compared with the other doses (10 and 30 mg x kg(-1) day(-1)). The results of the study revealed that alpha-lipoic acid could offer protection against chloroquine-induced hepatotoxicity. alpha-Lipoic acid had a better protective effect when compared with silymarin, a reference drug.