One of the main benefits is its antioxidant ability, which is more potent than most vitamins. Antioxidants are able to remove toxic chemicals called free radicals from the body. Perhaps the most important milk thistle benefits are its effects on the liver. The liver is one of the most important organs in the body, breaking down nutrients and cleaning the body out. Milk thistle detoxifies the liver as well as protects it against damage from toxins, alcohol and other negative effects. Milk thistle benefits the liver in other ways as well: it promotes regeneration and repair of liver cells, reverses liver damage and is very helpful in the treatment of hepatitis and cirrhosis.