ST MARYS THISTLE EXTRACT 4-1 is achieved from the plant Silybum marianum and is effective to treat gastrointestinal upset. It acts as a mild laxative and improves the effects of long term cancer treatment on heart and liver. It has immunostimulatory action and acts as an antioxidant by scavenging free radicals and also by inhibiting lipid peroxidation. Moreover, it is used to treat liver diseases effectively.