LL-37

LL-37 is a naturally occurring peptide associated with innate immune responses and host–microbe interactions. It has been investigated for antimicrobial activity, inflammatory signaling, and tissue repair, but these research interests do not establish therapeutic benefit.

LL-37 is produced by cells of the epithelial and immune systems. Its biological functions involve responses to microbial exposure and tissue damage, with effects that may vary according to the surrounding inflammatory environment.

Research discussed in the notes concerns direct antimicrobial effects and changes in immune activity. Additional work examines processes involved in tissue repair, although the notes do not identify specific molecular pathways or targets.

1. 01

   Molecular target

2. 02

   Cellular signal

3. 03

   Biological process

LEVEL 02 · Preclinical research

Laboratory or animal research exists. Findings do not transfer reliably to people.

Evidence levels reflect the state of documented research only. They are not rankings of popularity, quality or suitability, and a higher level never implies that a compound is an approved medicine.

The source guide presents LL-37 as a host-defense peptide with activity involving bacterial, viral, and fungal organisms. It also links the peptide to skin repair and the regulation of inflammatory responses. The guide characterizes tolerability favorably while mentioning local irritation, hypersensitivity, and possible excessive immune activation; the supplied notes do not provide evidence sufficient to verify these characterizations.

Source: The Complete Guide to Peptides: Unlocking the Secrets to Health, Healing and Longevity — Hack Smith, Chapter 6, Introduction to Peptides (page references not verified)

Summarised in our own wording from the cited reference. The reference is a popular guide, not peer-reviewed literature; its statements are reported here as source claims rather than established facts.

Dosage, reconstitution and administration guidance is deliberately excluded from this platform.

The notes do not establish whether experimental antimicrobial or repair-related findings translate into meaningful clinical outcomes. The strength of evidence, context-dependent inflammatory effects, and relevance to autoimmune conditions remain insufficiently specified.

Safety data are limited, and the supplied material does not support reliable estimates of adverse-event frequency or overall tolerability. Local irritation, hypersensitivity, and excessive immune activation are concerns raised by the guide rather than well-characterized risks in these notes. This summary is for educational purposes and is not medical advice.

Research-stage compound unless otherwise established by a competent authority. Regulatory classification differs between jurisdictions and can change over time; nothing here indicates marketing authorisation.

Primary reference for this entry:

The Complete Guide to Peptides: Unlocking the Secrets to Health, Healing and Longevity — Hack Smith, Chapter 6, Introduction to Peptides (page references not verified)

Suggested literature search terms taken from the source. They are search starting points, not citations to specific studies.

• “LL-37 antimicrobial peptide immunity”
• “LL-37 wound healing and skin regeneration”
• “LL-37 chronic inflammation and immune modulation”

Editorial status

source reviewed

Last updated

2026-09-14

Last reviewed

2026-09-13

Language

EN