Lactoferrin is an important protein found in milk.It exists widely in biological secretions and has a variety of physiological functions,including immunomodulatory and anti-inflammatory effects.This protein has been shown to bind and transport iron.HLF(Human Lactoferrin)and LF(Lactoferrin)have high sequence homology and the same function,inhibit bacterial growth and have a bactericidal effect on a variety of pathogens,and resist the excessive or harmful reactions of the host body,making it have a variety of effects.The concentration,quantity,integrity and iron saturation of lactoferrin can directly affect its effect.At present,due to its good health functions,lactoferrin has been incorporated into many commercial health products,including the use of infant formula and milk powder,cosmetics and functional foods.