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Compounds / LL-37

LL-37

Full name
LL-37 (Cathelicidin antimicrobial peptide, hCAP18 fragment)
Mechanism
The sole human cathelicidin-derived antimicrobial peptide. Broad-spectrum antimicrobial via membrane disruption, plus immunomodulatory and wound-healing/angiogenic signalling roles.
Half-life
short; rapidly degraded
Administration
subcutaneous (research), topical (research)
Typical dosage*
low: research-defined · typical: no established human therapeutic dose · high: research-defined
Researched for
antimicrobial/immune research, biofilm and chronic-infection research
Reported side effects
limited human safety data, cytotoxicity at higher concentrations (in vitro)
Interactions
not characterised
Commonly combined
research peptide; no established protocols
Scheduling
🇦🇺 AUNot ARTG-registered; research
🇺🇸 USNot FDA-approved
🇬🇧 UKNot licensed
Regulatory status
Research peptide. No established human therapeutic use or dosing.

*Doses are commonly-reported figures from public sources, not a recommendation. Educational only.

20studies
9faqs
immuneantimicrobialresearch

Studies (20)

YearTitle / venueSource
2025Antimicrobial Peptides of the Cathelicidin Family: Focus on LL-37 and Its Modifications
International journal of molecular sciences · preclinical
PMID 40869425
2025Decoding LL-37: Structure and antimicrobial mechanisms against microbial threats
Infection, genetics and evolution : journal of molecular epidemiology and evolutionary genetics in infectious diseases · preclinical
PMID 41270816
2025Exploring the Antimicrobial Potential of LL-37 Derivatives: Recent Developments and Challenges
ACS biomaterials science & engineering · preclinical
PMID 40423576
2025Vitamin D-inducible antimicrobial peptide LL-37 binds SARS-CoV-2 Spike and accessory proteins ORF7a and ORF8
Frontiers in cellular and infection microbiology · preclinical
PMID 41064641
2024LL-37: Structures, Antimicrobial Activity, and Influence on Amyloid-Related Diseases
Biomolecules · preclinical
PMID 38540740
2024Between good and evil: Complexation of the human cathelicidin LL-37 with nucleic acids
Biophysical journal · preclinical
PMID 37919905
2024LL-37 and bisphosphonate co-delivery 3D-scaffold with antimicrobial and antiresorptive activities for bone regeneration
International journal of biological macromolecules · preclinical
PMID 39059543
2023Antifungal properties of cathelicidin LL-37: current knowledge and future research directions
World journal of microbiology & biotechnology · preclinical
PMID 38057654
2023The LL-37 domain: A clue to cathelicidin immunomodulatory response?
Peptides · preclinical
PMID 37068711
2022LL-37 transports immunoreactive cGAMP to activate STING signaling and enhance interferon-mediated host antiviral immunity
Cell reports · preclinical
PMID 35649354
2021Antimicrobial Peptide, LL-37, And Its Potential As An Anti-HIV Agent
Clinical and investigative medicine. Medecine clinique et experimentale · preclinical
PMID 34600462
2020Therapeutic Potential of Cathelicidin Peptide LL-37, an Antimicrobial Agent, in a Murine Sepsis Model
International journal of molecular sciences · preclinical
PMID 32825174
2020Cathelicidin LL-37 (an antimicrobial peptide)-induced colistin dependence in Acinetobacter baumannii
Diagnostic microbiology and infectious disease · preclinical
PMID 32019695
2019Design of Antimicrobial Peptides: Progress Made with Human Cathelicidin LL-37
Advances in experimental medicine and biology · preclinical
PMID 30980360
2018Tissue-specific Regulation of Innate Immune Responses by Human Cathelicidin LL-37
Current pharmaceutical design · preclinical
PMID 29589544
2017Significance and Diagnostic Role of Antimicrobial Cathelicidins (LL-37) Peptides in Oral Health
Biomolecules · preclinical
PMID 29206168
2016LL-37: Cathelicidin-related antimicrobial peptide with pleiotropic activity
Pharmacological reports : PR · preclinical
PMID 27117377
2009The roles of cathelicidin LL-37 in immune defences and novel clinical applications
Current opinion in hematology · preclinical
PMID 19068548
2006LL-37, the only human member of the cathelicidin family of antimicrobial peptides
Biochimica et biophysica acta · preclinical
PMID 16716248
2005The human cathelicidin LL-37: a multifunctional peptide involved in infection and inflammation in the lung
Pulmonary pharmacology & therapeutics · preclinical
PMID 15939310

Questions (9)

What is LL-37?

LL-37 (LL-37 (Cathelicidin antimicrobial peptide, hCAP18 fragment)). The sole human cathelicidin-derived antimicrobial peptide. Broad-spectrum antimicrobial via membrane disruption, plus immunomodulatory and wound-healing/angiogenic signalling roles.

What is LL-37 used for?

Commonly discussed uses: antimicrobial/immune research, biofilm and chronic-infection research. The evidence base is largely preclinical (animal/in-vitro); published randomised human clinical trials are lacking or absent. Note: most uses are not approved indications.

How does LL-37 work?

Mechanism: The sole human cathelicidin-derived antimicrobial peptide. Broad-spectrum antimicrobial via membrane disruption, plus immunomodulatory and wound-healing/angiogenic signalling roles.

Is LL-37 safe?

Reported considerations: limited human safety data, cytotoxicity at higher concentrations (in vitro). The evidence base is largely preclinical (animal/in-vitro); published randomised human clinical trials are lacking or absent. Research peptide. No established human therapeutic use or dosing. This is not a safety endorsement; safety data for unapproved compounds is incomplete.

What is the typical dose of LL-37?

Commonly cited ranges (educational reference, not a recommendation): low research-defined, typical no established human therapeutic dose, high research-defined. Administration: subcutaneous (research), topical (research). Half-life: short; rapidly degraded.

Is LL-37 legal in Australia?

Australian status: Not ARTG-registered; research. Research peptide. No established human therapeutic use or dosing. General regulatory context: most active peptides are Schedule 4 and require a prescription; import via the Personal Importation Scheme requires a valid Australian prescription for prescription-only goods.

How do you store LL-37?

Reconstitution/storage reference: research-defined; storage: refrigerated/frozen aliquots.

What is LL-37 commonly stacked with?

Commonly discussed combinations (anecdotal for unapproved compounds): research peptide; no established protocols. Stacking increases interaction/safety uncertainty.