EVIDENCE TAKEAWAY
The short answer.
LL-37 is an important endogenous host-defense peptide, but complex pro-inflammatory, anti-inflammatory, antimicrobial, and cytotoxic actions make simple immune-support claims misleading.
WHAT IS LL-37?
Start with identity.
A human antimicrobial peptide involved in innate immune signaling and host defense.
- Entity type
- Native peptide
- Research category
- Immune / Inflammation
- Names and aliases
- LL-37
HUMAN VS PRECLINICAL
What evidence exists for LL-37?
The human peptide is well characterized biologically, but a reliable clinical efficacy program for marketed LL-37 products was not identified.
Antimicrobial, inflammatory, and cytotoxic effects are extensively studied in laboratory systems.
RESEARCH INTENT
What is LL-37 being studied for?
Current source-backed research areas include the topics below. Inclusion means the area is being investigated; it does not establish a treatment benefit.
- 01Antimicrobial defense
- 02Innate immunity
- 03Inflammation
- 04Cytotoxicity
U.S. REGULATORY STATUS
Is LL-37 FDA approved?
No FDA-approved LL-37 drug product; FDA reports insufficient human safety information for compounded LL-37 products.
SPORT STATUS
Is LL-37 prohibited in sport?
Not specifically named in the 2026 WADA List; athletes should verify current status and product contents.
Anti-doping rules and product ingredients can change. Athletes should verify the current official list and the exact product before making a real decision.
EVIDENCE LIMITS
What can the current record not establish?
COMMON SEARCH INTENTS
Reviewed questions about LL-37.
What is the evidence for LL-37?
LL-37 is an important endogenous host-defense peptide, but complex pro-inflammatory, anti-inflammatory, antimicrobial, and cytotoxic actions make simple immune-support claims misleading.
3 sources ResearchWhat is LL-37 being studied for?
Current source-backed research areas include Antimicrobial defense, Innate immunity, Inflammation, Cytotoxicity. These areas describe investigation, not established personal benefit.
3 sources FDA statusIs LL-37 FDA approved?
Current U.S. status for LL-37: No FDA-approved LL-37 drug product; FDA reports insufficient human safety information for compounded LL-37 products.
3 sources Sport statusIs LL-37 prohibited in sport?
Current sport-status snapshot for LL-37: Not specifically named in the 2026 WADA List; athletes should verify current status and product contents.
3 sources Evidence limitsWhat are the main evidence limits for LL-37?
Describing an endogenous function does not establish that administering a manufactured product is safe or beneficial.
3 sourcesPRIMARY AND OFFICIAL SOURCES