Lactoferrin for Immune Function

Research suggests that lactoferrin plays a meaningful role in supporting immune function through multiple mechanisms, including modulating inflammatory signaling, reinforcing mucosal barriers, exhibiting antimicrobial and antiviral activity, and regulating immune cell behavior. The evidence base includes a 2022 meta-analysis of 25 studies, several narrative reviews, and a range of in vitro, animal, and human supplementation studies, with findings generally pointing in a supportive direction, though the overall picture is mixed depending on the population and outcome measured. Studies indicate that benefits appear most consistent in infants and young animals, where lactoferrin-containing formulas were associated with modest reductions in respiratory infection incidence and improvements in immune markers, while effects in adults were less clear, with some evidence of reduced IL-6 levels but no significant impact on other inflammatory markers like CRP. Limitations across the literature include variability in study design, small sample sizes, differing doses and formulations, and the challenge of isolating lactoferrin's effects from other co-administered bioactives, meaning the full scope and clinical significance of its immune-related benefits remain an active area of investigation.