The gut contains 70–80% of the body's immune tissue (gut-associated lymphoid tissue, GALT) including Peyer's patches, mesenteric lymph nodes, and intraepithelial lymphocytes. Lactoferrin interacts directly with GALT via M cell transcytosis across follicle-associated epithelium, modulating the entire mucosal immune network from within the gut lumen.

Does lactoferrin help with IgA deficiency?

Selective IgA deficiency is a genetic immune disorder requiring specialist evaluation. Lactoferrin cannot restore IgA production in true IgA deficiency. It may modestly support IgA in individuals with age-related sIgA decline.

Is there a connection between gut lactoferrin and brain health?

Yes, via the gut-brain axis. Lactoferrin's gut microbiome modulation produces SCFA (short-chain fatty acids) that cross the BBB and modulate brain inflammation. Lactoferrin's mucosal immune calibration also reduces the systemic inflammation that drives neuroinflammation.