13Z,16Z-Docosadienoic Acid is a GPR120 agonist with bactericidal activity. 13Z,16Z-Docosadienoic acid serves as a potential biomarker for canine mammary tumors. 13Z,16Z-Docosadienoic acid is used in the research of bacterial infections, Lyme disease, Graves' disease and mammary tumors.