LL-37 for chronic sinus infections — promising case reports
Wanted to bring some attention to LL-37 (cathelicidin), which doesn't get discussed much here but has interesting antimicrobial properties. It's a human host defense peptide that plays a role in innate immunity — your body naturally produces it. I've been following case reports of LL-37 nasal application for chronic rhinosinusitis, particularly biofilm-associated infections that don't respond well to antibiotics. The peptide disrupts bacterial biofilms and has direct antimicrobial activity against common sinus pathogens. Anyone here tried it for chronic infections or immune support? The research is still early but the mechanism is compelling.
Replies (2)
The biofilm disruption angle is what makes LL-37 interesting beyond typical antibiotics. Biofilms are the reason chronic sinus infections keep recurring — bacteria in biofilm state are 100-1000x more resistant to antibiotics. LL-37 can destabilize the biofilm matrix and expose the bacteria to the immune system or concurrent antibiotics. The challenge is delivery and stability. LL-37 degrades relatively quickly in biological fluids. Some researchers are working on stabilized analogs or nanoparticle delivery systems. For nasal use, the short transit time might actually be less of an issue than systemic delivery. No personal experience with it, but I'm watching the research closely. The 2024 paper in Frontiers in Microbiology on LL-37 nasal irrigation was promising.
Used LL-37 (subQ, 50mcg daily for 4 weeks) as part of a protocol after a stubborn MRSA skin infection that kept recurring. Hard to attribute results specifically to LL-37 since I was also on antibiotics, but the infection finally cleared and hasn't come back in 6 months. My integrative doc was the one who suggested adding it. Interesting peptide that deserves more attention.