Clinical research review: usefulness of bovine lactoferrin in child health.

Lactoferrin (LF) is abundant in human milk and plays an important role in the health of children. Bovine LF (bLF) has high homology with human LF and has been reported to have multiple biological functions. Several clinical studies have been conducted considering these properties, which reported the usefulness of bLF. This review was aimed to provide an overview of the clinical evidence in children. We searched clinical reports investigating the effects of bLF in children and identified 36 studies on the role of bLF in infections, iron metabolism, body growth, cerebral development, and fecal microbiome. Considering the accumulated evidence, bLF may contribute to the child health, particularly by suppressing or alleviating gastrointestinal and respiratory symptoms, and improving the iron status of children with anemia or those at high risk of anemia. The dose of bLF varies depending on the expected effect and target age, but may not necessarily have to be as high as human LF in human milk. Some of the beneficial effects of bLF have not been fully validated due to limited clinical evidence or being observed in the secondary analysis of some studies. Further clinical evidence would add significant value to the use of bLF in child health.