Glutathione is a naturally synthesised peptide in human cytoplasm. It is composed of glutamic acid, cysteine and glycine. It contains sulfur group. It is widely distributed in various organs of the body. It plays an important role in maintaining the biological function of cells. It can activate a variety of enzymes, thus promoting the metabolism of sugar, fat and protein, and affecting the metabolic process of cells. It can be combined with free radicals in the body by sulfur radical, which can be converted into acid substances that are easy to metabolize, thus accelerating the excretion of free radicals, which helps to reduce the toxic and side effects of chemotherapy and radiotherapy, and has no obvious impact on the efficacy of chemotherapy and radiotherapy. In addition, it can protect the synthesis, detoxification, inactivation of hormones and other functions of the liver, promote the metabolism of bile acid, and is conducive to the absorption of fat and fat soluble vitamins in the digestive tract