Lactoferrin - a critical component of the immune system
Lactoferrin (aka lactotransferrin) is a glycoprotein widely present in fluids such as milk, tears and saliva. Lactoferrin has antimicrobial activity acting as a bacteriocid and fungicide forms part of the body's basic defense system.
Lactoferrin appears to protect against bacterial infection possibly by preventing growth or by destroying their cell walls. Lactoferrin present in breast milk, particularly "first milk" is thought to assist breast-fed infants in warding off bacterial infections.