Inflammaging — chronic low-grade inflammation — underlies virtually every age-related disease. Lactoferrin's age-related decline tracks this process, and the emerging evidence suggests supplementation can help reverse it.
In 2000, Italian immunologist Claudio Franceschi proposed a concept that would reshape how scientists think about aging: inflammaging. The term describes the chronic, low-grade, sterile inflammatory state that develops insidiously with age and serves as the common biological soil from which virtually every major age-related disease grows — cardiovascular disease, type 2 diabetes, neurodegeneration, cancer, frailty, and loss of immune function. Unlike the acute inflammation triggered by infections or injuries (which resolves cleanly), inflammaging is smoldering and persistent. Your immune system is perpetually slightly activated, slowly damaging tissues and accelerating biological aging.
Two decades of research have confirmed Franceschi's insight and identified the mechanisms: the accumulating burden of senescent cells and their toxic SASP secretions; declining autophagy allowing cellular debris to accumulate; loss of the gut barrier enabling bacterial endotoxins into circulation; mitochondrial dysfunction generating chronic oxidative stress; and the gradual collapse of immune regulation that normally keeps inflammation in check. What is less widely appreciated is that one of the most important regulators of this entire system — a protein your body produces abundantly in youth and steadily loses with age — is lactoferrin.
Lactoferrin levels in human serum follow a consistent and striking age-related trajectory. Concentrations are highest in early life (when the immune system is establishing itself), remain robust through young adulthood, and then begin a progressive decline that accelerates after age 50. By the seventh decade, many individuals have serum lactoferrin concentrations 30–50% below youthful levels. This decline is not incidental.
Lactoferrin is synthesized and secreted by neutrophils — the frontline soldiers of innate immunity — and by epithelial cells lining mucosal surfaces (gut, respiratory tract, urogenital tract). As neutrophil function declines with immunosenescence and mucosal barrier integrity deteriorates with age, lactoferrin production falls accordingly. The result is a weakening of one of the body's primary anti-inflammatory, antimicrobial, and immune-regulatory networks precisely when it is needed most.
A 2020 review published in the *International Journal of Molecular Sciences* documented this trajectory in detail, showing that falling lactoferrin tracks directly with rising IL-6, TNF-α, and hs-CRP — the canonical inflammaging cytokines — and with declining regulatory T-cell function. The implication: restoring lactoferrin toward youthful levels through supplementation is a mechanistically coherent strategy for reducing inflammaging.