N-Formyl-Met-Leu-Phe is a peptide composed of 3 amino acids, the N-terminus is formylated, N-Formyl-Met-Leu-Phe is an inhibitor peptide, and also an N-formyl peptide receptor (FPR) specific ligand; In addition, N-Formyl-Met-Leu-Ph can inhibit the secretion of TNF-alpha.