Breast cancer chemotherapy protein powder has no direct therapeutic effect, and has the role of nutritional supplement. Protein powder belongs to nutritional products, no direct treatment of breast cancer. The consumption of protein powder by patients undergoing chemotherapy for breast cancer also has the function of nutritional supplementation, but it can not replace other nutrients such as carbohydrates, fats and vitamins required by the human body. Diversifying your diet and eating more different foods can provide a more complete access to nutrients. In addition, excessive consumption of protein powder may increase the burden on the gastrointestinal tract and kidneys, and patients are advised to consume it under the guidance of a dietitian or doctor.