Ensure is an enteral nutrition drug, an enteral total balanced nutrition powder, and a prescription drug. Ensure cannot be used for parenteral or intravenous use, and can be used as a nutrient supplement when taken orally, and can be used as the only source of total nutrition when tube feeding is required if it cannot be taken orally. It is a compound preparation, its composition mainly includes protein, fat, carbohydrates, vitamins, minerals and so on. It is suitable for people, who should be over 4 years old. Its main role and efficacy is to provide high quality nutrition that can enhance hematopoietic and immune functions. It can be used for tube feeding for people with gastrointestinal fistula or coma, nutritional provision or supplementation for tumor patients receiving chemotherapy, radiotherapy and radiation therapy.