LL-37 Price Comparison

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Best Price R1,010.00
Average R1,010.00
Highest R1,010.00
1 result
Best Price
White Rabbit Labs logo

LL-37

In Stock 10mg Lab Tested
R1,010.00
+ R120.00 delivery

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LL-37 Profile

Well Studied

Human Cathelicidin | Antimicrobial Peptide

Overview

LL-37 is the only human cathelicidin antimicrobial peptide, a 37-amino acid cationic peptide derived from hCAP18 that exhibits broad-spectrum antimicrobial activity against bacteria, viruses, and fungi while modulating immune responses.

Mechanism of Action

Provides direct antimicrobial activity through membrane disruption, promotes wound healing by enhancing keratinocyte migration and angiogenesis, and modulates immune responses without systemic exposure when used topically.

Key Benefits

  • Direct wound healing acceleration
  • Broad-spectrum antimicrobial activity
  • Activity against resistant bacteria (MRSA, MDRPA)
  • Enhanced tissue regeneration
  • Immune modulation
  • Local antimicrobial protection

Quick Stats

Typical Dose
0.5-1.6 mg/mL topical gel or 100-150 mcg injectable
Frequency
Topical: Daily to twice weekly on wounds. Injectable: Once daily subcutaneous
Cycle Duration
2-8 weeks depending on wound healing progress
Storage
Lyophilized: 2-8°C. Reconstituted: 2-8°C, maintain sterility

Molecular Information

Length
37 amino acids
Type
Cationic antimicrobial peptide
Half-Life
Short (rapid proteolytic degradation)

Modifications

Derived from hCAP18 protein

Research Indications

The following information is derived from published scientific literature and is provided for educational and research reference purposes only. It does not constitute medical advice, diagnosis, or treatment recommendations. These peptides are not approved for human use and are sold exclusively for in-vitro laboratory research.

Chronic Venous Leg Ulcers

Most Effective

68% ulcer area reduction demonstrated with 0.5mg/mL concentration in clinical trials.

Diabetic Foot Ulcers

Effective

Enhanced granulation tissue formation and wound closure.

Pressure Ulcers

Effective

Accelerated healing demonstrated in animal models.

Innate Immune Enhancement

Effective

Boosts natural immune defenses against pathogens.

Antimicrobial Resistance

Effective

Active against MRSA and multi-drug resistant bacteria with >4 log reduction in biofilms.

Immunomodulation

Effective

Balances immune responses without causing immunosuppression.

Epithelial Cell Proliferation

Moderate

Stimulates skin cell growth and regeneration.

Angiogenesis Promotion

Moderate

Promotes new blood vessel formation for tissue repair.

Collagen Synthesis

Moderate

Supports collagen production for wound healing.

Dosing Protocols

topical

Topical application is the most established route, providing direct access to wound sites with minimal systemic exposure.

Goal Dose Frequency Route
Wound healing - Standard 0.5mg/mL gel/cream Daily to twice weekly Direct wound application
Wound healing - Intensive 1.6mg/mL gel/cream Daily Direct wound application

Key Tips

  • Direct access to wound site
  • Minimal systemic exposure
  • Most established clinical data
Steps
  1. 1 Clean and debride wound area
  2. 2 Apply thin layer directly to wound surface
  3. 3 Cover with sterile dressing if needed
  4. 4 Change per clinical protocol (daily to twice weekly)
  5. 5 Monitor healing progress and adjust frequency
  6. 6 Document wound measurements and progression

injectable

Subcutaneous injection provides systemic distribution for immune modulation. Limited clinical data compared to topical.

Goal Dose Frequency Route
Systemic immune support 100-150mcg Once daily SubQ

Key Tips

  • Systemic distribution
  • Abdomen, thigh, upper arm injection sites
Materials Needed
LL-37 lyophilized powder Bacteriostatic water Insulin syringes Alcohol swabs
Steps
  1. 1 Allow vial to reach room temperature
  2. 2 Add bacteriostatic water slowly to peptide
  3. 3 Gently swirl (don't shake vigorously)
  4. 4 Calculate dose based on final concentration
  5. 5 Use sterile injection technique
  6. 6 Rotate injection sites daily

Peptide Interactions

BPC-157

Synergistic

Enhanced wound healing through complementary mechanisms.

TB-500

Synergistic

Combined anti-inflammatory and healing effects.

Conventional Antibiotics

Synergistic

FICI values 0.25-0.5 against resistant bacteria when combined.

Vitamin D3

Synergistic

Acts as cofactor for endogenous LL-37 production.

Lactoferrin

Compatible

Safe combined use with no negative interactions.

Physiological Salt Solutions

Monitor

High salt concentrations may reduce antimicrobial activity.

Amino Acid Solutions

Avoid

Physical incompatibility, especially with IV formulations.

What to Expect

Week 1-2

Reduced bacterial load, initial wound bed preparation

Week 2-4

Increased granulation tissue formation, epithelial migration

Week 4-6

Significant wound size reduction

Week 6-8

Continued healing toward wound closure

Side Effects & Safety

Common Side Effects

  • Generally well-tolerated
  • Mild injection site reactions (injectable)
  • Local irritation at application site (topical)

Monitoring

  • Injection site reactions and excessive irritation
  • Signs of wound infection
  • Allergic reactions or contact dermatitis
  • Wound healing progress

Stop Signs

  • Severe injection site reactions with spreading inflammation
  • Allergic reaction signs (rash, difficulty breathing, swelling)
  • Persistent flu-like symptoms
  • Signs of wound infection (increased redness, warmth, drainage)
  • Worsening wound condition or delayed healing
  • Unusual pain or irritation at application site

Contraindications

  • Pre-existing hypersensitivity to peptides
  • Compromised immune status (relative contraindication)
  • Non-sterile wound environments

Quality Checklist

Good Signs

  • Sterile, clear formulation
  • ≥98% purity by HPLC
  • White to off-white lyophilized powder
  • Proper cold chain maintenance (2-8°C)
  • Appropriate gel base compatible with peptide activity
  • Clinical-grade concentrations (0.5-1.6mg/mL)

Warning Signs

  • Brief room temperature exposure acceptable if promptly refrigerated
  • Homemade topical formulations may lack sterility

Bad Signs

  • Discolored or cloudy solutions
  • Yellow discoloration or visible particles
  • Pre-mixed liquid formulations (LL-37 unstable long-term)
  • Non-sterile preparations
  • Microbial contamination

Research & References

Latest Research

2025

LL-37: Master Antimicrobial Peptide Review

International Journal of Antimicrobial Agents

Comprehensive review of broad functions from infection to cancer immunity.

Key References

  1. 2014

    Venous Leg Ulcer Trial - Grönberg et al.

    Wound Repair and Regeneration

    68% ulcer area reduction demonstrated at optimal doses in chronic venous leg ulcers.

  2. 2015

    Melanoma Phase I Trial

    Intratumoral LL-37 in melanoma patients demonstrated safety and immune stimulation (NCT02225366).

  3. 2019

    MRSA Biofilm Study - Noore et al.

    PLOS ONE

    >4 log reduction in MRSA biofilms compared to conventional antibiotics.

  4. 2008

    Structural Analysis - Wang et al.

    Journal of Biological Chemistry

    NMR spectroscopy determining 3D structure of LL-37.

Search PubMed for LL-37

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