APD668 is primarily utilized in research settings for its role as a potent and selective agonist of the GPR119 receptor. This receptor is involved in the regulation of glucose-dependent insulin secretion, making APD668 a valuable tool in studies focused on diabetes and metabolic disorders. Researchers use it to investigate the mechanisms of GPR119 activation and its potential therapeutic effects on blood glucose control. Additionally, APD668 aids in exploring the receptor's impact on appetite regulation and energy homeostasis, contributing to advancements in treatments for obesity and related conditions. Its application is largely confined to preclinical studies, where it helps in understanding the signaling pathways and physiological responses associated with GPR119 activation.