Peptide YY Fragment 3-36 human is primarily used in research to study its role in appetite regulation and energy balance. It is known to suppress appetite by acting on the brain's hunger centers, making it a subject of interest in obesity and metabolic disorder studies. Additionally, it is investigated for its potential therapeutic applications in managing conditions like type 2 diabetes and gastrointestinal disorders due to its effects on gut motility and insulin secretion. In clinical settings, it may be explored as a treatment to reduce food intake and promote weight loss in patients with obesity-related health issues.