What are health food products? Nutraceuticals are foods that claim to have specific health functions or are intended to supplement vitamins and minerals, generally known as “dietary supplements” in Europe and America, including vitamins, minerals, herbs, amino acids, etc. Do tumor patients who are immune deficient need the escort of health care products? Many patients feel that their immunity is significantly reduced after multiple treatments, so they need to take a lot of health supplements to improve their immunity to prevent the recurrence of the disease. In fact, the basis of immunity is balanced nutrition, and the best source of influence is obtained from natural food, so if the diet is not affected, the diet structure is reasonable, and the diet is balanced, there is no need to take additional supplements. To date, it has not been proven that supplements can improve the prognosis of cancer patients, but on the contrary, they may increase the risk of death. Various dietary supplements and multivitamins are not associated with recurrence, breast cancer mortality and overall mortality after early breast cancer diagnosis. How to use supplements properly? Breast cancer patients should try to get the necessary nutrients from the diet. Nutrient supplements should be considered only when clinical manifestations or biochemical indicators suggest nutrient deficiency, and when patients cannot get enough nutrients from food and the intake is only 2/3 of the recommended amount.