LL-37
Infections, wound healingYour body's own antimicrobial weapon. Fights bacteria, breaks up biofilms, helps wounds heal.
In Plain English
Your immune system's first line of defense — kills harmful bacteria and helps repair the damage they cause.
At a glance
Your own antimicrobial peptide. Injection sites hurt. Evidence grade C on an A-to-D scale.
Reported practice from trials and the community, not a recommendation for anyone.
What Researchers Have Studied It For
Studied for
Published Research
Common questions about LL-37
What is LL-37 used for?
Researchers have studied LL-37 for fighting bacterial infections, breaking up biofilms, wound healing, and more. In plain terms: Your immune system's first line of defense — kills harmful bacteria and helps repair the damage they cause.
Is LL-37 FDA-approved?
No. LL-37 is not approved for human use anywhere. It is sold as a research chemical, which means no manufacturing standard, no batch recall and no one to report a problem to. The only quality control is the buyer's own.
How is LL-37 usually taken?
The commonly reported pattern is under the skin, daily, for short courses. That describes reported practice from trials and the community. It is not a recommendation for anyone, and several of these compounds interact with common medications.
How strong is the evidence for LL-37?
Grade C on this site's A-to-D scale. C means tested only in animals or cells, so everything about human use is an educated guess. Your own antimicrobial peptide. Injection sites hurt.
Is LL-37 banned in drug-tested sport?
It is not specifically listed by the World Anti-Doping Agency, but tested athletes should check the current list and their federation's rules, since related compounds and blends often are.
How long does LL-37 stay in the body?
The half-life, the time for half a dose to leave the body, is about ~30 minutes. A short half-life means it wears off fast and is taken more often; a long one means once a week can be enough. Stored as a dry powder it keeps for months in the fridge; once mixed with water it is used within a few weeks.