PCSK9-IN-29 serves as a lipid-lowering agent that enhances the expression of low-density lipoprotein receptor (LDLR) protein and reduces PCSK9 protein expression in hepG2 cells. Additionally, in crab-eating macaques on a high-fat diet, it lowers serum LDL-C, TC, and liver enzyme ALT levels, reduces body weight and fat, and boosts bone mineral content. PCSK9-IN-29 is useful for studies involving non-alcoholic fatty liver disease and obesity.