In this study, researchers wanted to see if giving rats a low dose of acetylcysteine could help with liver damage caused by a chemical called carbon tetrachloride (CCl4). They used 93 rats, some were given CCl4 to damage their livers, while others were not. Results showed that rats with liver damage had higher levels of certain liver enzymes and substances compared to healthy rats. However, rats treated with small and medium doses of acetylcysteine had higher levels of helpful substances in their livers, suggesting that acetylcysteine might be protective against liver injury. These findings indicate that low doses of acetylcysteine could potentially help with chronic liver damage in rats.