Lactoferrin is a safe and reliable natural substance extracted from cow’s milk and has no side effects on babies. Lactoferrin is commonly found in the milk and other tissue fluids of mammals (e.g., in tears, bile, synovial fluid, and neutrophils), and is most abundant in colostrum, gradually decreasing with the duration of breastfeeding. Lactoferrin, a non-heme iron-binding protein, is a member of the transferrin family and is one of the nutrients that protects new life from immunity for the first time. Lactoferrin promotes the absorption of iron in the body. After a baby sucks on breast milk, the lactoferrin in breast milk binds with high affinity to iron in his digestive tract, transporting it to the cells of the small intestine and releasing it to supply the baby’s whole body needs. Another special function of lactoferrin is that it is antibacterial, antiseptic and antiviral, and it is not harmful to probiotics (such as bifidobacteria) in the human body. Lactoferrin also promotes and enhances the immune function of immune cells such as neutrophils, macrophages and natural killer cells in the body, and lactoferrin regulates the production of antibodies in the body. Lactoferrin is suitable for people who are immunocompromised; patients recovering from surgery or disease; babies and premature infants who do not have breast milk to eat; mothers-to-be during preparation or pregnancy; and children or elderly people who are frail and sickly to supplement. Theoretically, lactoferrin may have the above-mentioned effects, but whether the actual product can play a role is still subject to many influences, do not blindly follow the trend to use