LL-37 is a 37-amino-acid peptide derived from the human cathelicidin family, an important part of the innate immune system. It exhibits broad-spectrum antimicrobial activity and interacts with multiple cellular targets involved in immune regulation, inflammation, and tissue repair. Research suggests LL-37 may help neutralize bacterial endotoxins, modulate cytokine signaling, stimulate angiogenesis and epithelial cell migration, and support wound closure in cellular models of tissue damage and infection. Its multifunctional profile — combining immune modulation, antimicrobial signaling, and tissue response mechanisms — makes it a focus of research in infection control, inflammation biology, and regenerative processes.