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preclinicalImmune & Inflammation

Lactoferricin

Also known as: Lactoferricin B, LfcinB, Lactoferricin H, LfcinH, Lactoferrin-derived peptide

Lactoferricin is a potent antimicrobial peptide released by pepsin digestion of lactoferrin, an iron-binding glycoprotein found in milk, saliva, tears, and other mucosal secretions. Lactoferricin B (from bovine lactoferrin, 25 amino acids) is more extensively studied than lactoferricin H (from human lactoferrin, 47 amino acids). It demonstrates broad-spectrum antimicrobial, anticancer, and immunomodulatory activities that exceed those of intact lactoferrin, making it a promising lead compound for therapeutic development.

3 cited references·6 researched benefits

Quick Answer

Lactoferricin is an antimicrobial peptide derived from pepsin digestion of lactoferrin, a protein found in milk and mucosal secretions. It has broad-spectrum activity against bacteria, fungi, viruses, and parasites, and also shows significant anticancer properties by inducing apoptosis in tumor cells. Lactoferricin B (bovine, 25 amino acids) is more potent than the intact lactoferrin protein. Research is preclinical, focusing on its dual antimicrobial and anticancer potential as a natural peptide therapeutic.

Key Facts

Mechanism
Lactoferricin kills microbes through electrostatic interaction between its cationic residues (particularly a cluster of arginine and tryptophan in the loop region) and anionic microbial membrane components. Upon membrane binding, it disrupts lipid bilayer integrity leading to permeabilization and cell death. Against cancer cells, lactoferricin induces apoptosis through mitochondrial membrane disruption, cytochrome c release, and caspase activation. It preferentially targets cancer cells over normal cells due to the higher proportion of anionic phosphatidylserine on cancer cell surfaces and the presence of negatively charged mucin glycoproteins. Lactoferricin also has immunomodulatory effects, enhancing NK cell and macrophage cytotoxicity and promoting Th1 immune responses.
Research Status
preclinical
Half-Life
Variable; rapidly degraded by serum proteases (~minutes to hours)
Molecular Formula
C₁₄₅H₂₃₅N₄₅O₃₅S₄
Primary Use
Immune & Inflammation
Table of Contents

Benefits

  • Broad-spectrum antimicrobial activity against bacteria, fungi, viruses, and parasitesstrong
  • Anticancer activity through selective apoptosis induction in tumor cellsmoderate
  • More potent antimicrobial activity than intact lactoferrin proteinstrong
  • Enhances NK cell and macrophage cytotoxicity for improved immune surveillancemoderate
  • Anti-biofilm activity against Candida and bacterial biofilms on medical devicespreliminary
  • Derived from a natural food protein (milk), suggesting favorable safety profilepreliminary

Dosage Protocols

RouteDosage RangeFrequencyNotes
Oral (as part of lactoferrin hydrolysate)100–500 mg lactoferrin hydrolysateDailyPepsin-digested lactoferrin supplements containing lactoferricin; dosing extrapolated from lactoferrin studies
Research use only (purified lactoferricin)1–100 mcg/mL (in vitro)VariablePreclinical studies investigating antimicrobial, anticancer, and immunomodulatory applications
Topical (investigational)10–100 mcg/mL in carrier formulationDailyUnder investigation for wound care, oral health, and anti-biofilm applications

Medical disclaimer

Dosage information is provided for educational reference only. Always follow your prescriber's instructions and consult a qualified healthcare provider before starting any peptide protocol.

Side Effects

  • Gastrointestinal discomfort at high oral dosescommon
  • Hemolytic activity at concentrations above the therapeutic windowrare
  • Allergic reactions in individuals with milk protein sensitivityrare
  • Limited human safety data — systemic toxicity profile not fully characterizedserious

Frequently Asked Questions

What is the difference between lactoferrin and lactoferricin?
Lactoferrin is a large iron-binding glycoprotein (approximately 80 kDa) found in milk, saliva, and other body fluids with modest antimicrobial activity. Lactoferricin is a small peptide fragment (25 amino acids for bovine, 47 for human) released when lactoferrin is digested by pepsin in the stomach. Lactoferricin is significantly more potent as an antimicrobial than intact lactoferrin because the active antimicrobial domain, which is partially buried in the intact protein, is fully exposed in the free peptide.
Does lactoferricin have anticancer properties?
Yes. Lactoferricin B has demonstrated anticancer activity against multiple tumor types in preclinical studies, including leukemia, breast cancer, colon cancer, and neuroblastoma. It selectively kills cancer cells by exploiting the increased negative charge on their surfaces (due to exposed phosphatidylserine and surface mucins) while sparing normal cells. It induces apoptosis through the mitochondrial pathway and has shown synergy with conventional chemotherapy drugs in laboratory models.
Can I get lactoferricin from drinking milk?
When you consume milk or lactoferrin supplements, stomach acid and pepsin naturally digest lactoferrin to release lactoferricin in the gastrointestinal tract. This is believed to contribute to the antimicrobial protection that breast milk provides to infants. However, the amount of bioactive lactoferricin generated from normal milk consumption is variable and likely lower than concentrations used in research. Lactoferrin supplements and hydrolyzed lactoferrin products provide more consistent levels.

References

  1. 1
    A bactericidal domain of lactoferrin that acts on gram-negative bacteria(1992)PubMed ↗
  2. 2
    Lactoferricin: a multifunctional peptide derived from lactoferrin(2010)PubMed ↗
  3. 3
    Anticancer activity of bovine lactoferricin and its mechanism of action(2002)PubMed ↗

Latest Research

Last updated: 2026-02-19