LL-37 Dosage Guide: How Much Should You Take? (2026)

Key Takeaways

• Standard Dosage Range: LL-37 is typically dosed between 0.5 mg to 2 mg per administration, depending on the form and therapeutic goal.
• Administration Method: Commonly administered subcutaneously; other routes include topical and intranasal.
• Typical Cycle Length: Treatment cycles often range from 4 to 12 weeks, with adjustments based on response and goals.
• Regulatory Status: LL-37 is not FDA-approved and is available for research purposes only.
• Medical Supervision: Professional guidance is crucial due to variability in dosing needs and potential side effects.

How LL-37 Works in the Body

LL-37, a cationic α-helical peptide, is derived from the C-terminal region of human cathelicidin (hCAP18). It plays a crucial role in the body's innate immune response by disrupting microbial membranes and modulating the immune system via the TLR/NF-κB pathways. This peptide's effectiveness is influenced by its receptor binding affinity, half-life, and bioavailability, all of which are critical considerations when determining the appropriate dosage.

The pharmacokinetics of LL-37 indicate a relatively short half-life, necessitating frequent dosing to maintain therapeutic levels. Its bioavailability can vary significantly depending on the administration route, with subcutaneous injections often preferred for their balance of efficacy and convenience.

"LL-37 is a multifunctional host defense molecule essential for normal immune responses to infection and tissue injury." (PMID 20049649)

"Antimicrobial peptides like LL-37 act as effector molecules in host defense against inhaled pathogens." (PMID 15939310)

Standard LL-37 Dosage Ranges (By Form)

Subcutaneous Administration

• Dosage Range: 0.5 mg to 2 mg per injection
• Frequency: Typically once daily or every other day
• Bioavailability: High, due to direct absorption into the bloodstream
• Common Use: Preferred for systemic effects and ease of use

Topical Application

• Dosage Range: Concentrations vary based on formulation, often between 0.1% to 1% in creams or gels
• Frequency: Applied 1-2 times daily
• Bioavailability: Lower than injectable forms, but effective for localized skin conditions
• Common Use: Used for skin infections and inflammatory conditions like rosacea (PMID 38450615)

Intranasal Administration

• Dosage Range: 0.5 mg to 1 mg per spray
• Frequency: 1-2 times daily
• Bioavailability: Moderate; effective for targeting respiratory tract infections
• Common Use: Investigated for respiratory infections and inflammation (PMID 15939310)

LL-37 Dosage by Use Case

Antimicrobial Research

• Dosage Range: 0.5 mg to 2 mg subcutaneously
• Administration Method: Subcutaneous injection
• Cycle Length: 6-12 weeks
• Clinical Reference: Studies indicate LL-37's efficacy in reducing microbial load in infections (PMID 20049649)
• Practical Guidance: Many research protocols recommend starting at a lower dose and adjusting based on response.

Immunomodulatory Research

• Dosage Range: 1 mg subcutaneously
• Administration Method: Subcutaneous injection
• Cycle Length: 8 weeks
• Clinical Reference: LL-37 modulates immune pathways, potentially beneficial in inflammatory conditions (PMID 20600427)
• Practical Guidance: Clinics often prescribe LL-37 alongside other immune-modulating therapies.

Skin Conditions (e.g., Rosacea)

• Dosage Range: 0.1% to 1% topical application
• Administration Method: Topical
• Cycle Length: 4-8 weeks
• Clinical Reference: Topical LL-37 has shown promise in reducing inflammation and symptoms in rosacea (PMID 38450615)
• Practical Guidance: Application frequency and concentration should be tailored to the severity of the condition.

How Long Should You Take LL-37?

Typical LL-37 cycles last between 4 to 12 weeks, with adjustments based on individual response and therapeutic goals. During the initial weeks, patients may notice gradual improvements, with more pronounced effects often observed by weeks 6 to 8. Tapering is generally not required, but discontinuation should be monitored by a healthcare provider to assess any rebound effects or symptom recurrence.

Administration Protocol: How to Take LL-37

Subcutaneous Injection

• Needle Gauge: 29-31 gauge, 0.5-inch needle
• Injection Sites: Rotate between abdomen, thigh, and upper arm
• Rotation Schedule: Avoid using the same site consecutively to minimize irritation

Storage Requirements

• Temperature: Store at 2-8°C (36-46°F) in a refrigerator
• Light Sensitivity: Protect from light exposure
• Reconstituted Stability: Use within 30 days of reconstitution

Reconstitution Instructions

• Diluent: Use bacteriostatic water for injection
• Procedure: Slowly add diluent to the vial, gently swirling to dissolve the peptide
• Link: Reconstitution Guide

Stacking LL-37 for Better Results

LL-37 and Thymosin Beta-4

• Combination Rationale: Enhances tissue repair and immune modulation
• Dosing Synergy: LL-37 (1 mg) and Thymosin Beta-4 (2 mg) per injection
• Common Protocols: Used in protocols targeting chronic inflammatory conditions

LL-37 and BPC-157

• Combination Rationale: Promotes gut healing and systemic anti-inflammatory effects
• Dosing Synergy: LL-37 (1 mg) and BPC-157 (250 mcg) per injection
• Common Protocols: Often prescribed for gastrointestinal and musculoskeletal issues

Factors That Affect Your LL-37 Dosage

Dosing adjustments may be necessary based on individual factors such as body weight, age, treatment goals, and organ function (particularly kidney and liver). Providers tailor dosing to account for these variables, ensuring optimal therapeutic outcomes while minimizing risks.

Common Dosing Mistakes to Avoid

1. Dosing Too High/Too Low: Adhering to recommended ranges is crucial to avoid adverse effects or suboptimal results.
2. Inconsistent Timing: Maintaining a consistent dosing schedule enhances efficacy and minimizes side effects.
3. Wrong Injection Site for the Goal: Choose appropriate sites based on the desired systemic or localized effects.
4. Not Accounting for Regulatory Status: LL-37 is not FDA-approved; use is limited to research contexts.
5. Poor Storage/Handling: Improper storage can degrade the peptide, reducing its effectiveness.

What the Evidence Does Not Show

While LL-37 shows promise in various research contexts, long-term safety data in humans are limited. Most studies are preclinical or conducted in vitro, and comprehensive dose-response data are lacking. Caution is advised when interpreting these findings for clinical use.

FAQ — Your Top LL-37 Dosage Questions Answered

Best time of day to take it?
LL-37 can be administered at any time, but consistency is key. Some prefer morning doses to align with daily routines.

What if you miss a dose?
If a dose is missed, take it as soon as you remember unless it's close to the next scheduled dose. Do not double up.

Can men and women use the same dose?
Dosing is generally similar for both genders, but individual factors may necessitate adjustments.

Can you stack it with other peptides?
Yes, LL-37 can be combined with peptides like Thymosin Beta-4 or BPC-157 for synergistic effects.

How long until you see results?
Improvements may begin within weeks, with more significant changes often seen by week 6.

Do you need to cycle off?
Cycling off is not mandatory but can be considered based on treatment goals and response.

Is a loading dose needed?
A loading dose is not typically required for LL-37.

How to adjust dose if side effects occur?
Consult your healthcare provider to adjust dosing if adverse effects are experienced.

Conclusion — Finding the Right Dosage for You

Determining the appropriate LL-37 dosage involves careful consideration of individual needs and therapeutic goals. Medical supervision is essential to optimize outcomes and ensure safety. For further information, explore our peptide encyclopedia and use our clinic finder to connect with a qualified provider.

Medical Disclaimer: This content is for informational purposes only and does not constitute medical advice. Dosage information is compiled from published research and clinical protocols. Consult a licensed healthcare provider before starting any peptide therapy. Use our clinic finder to locate a qualified provider near you.