Peptide YY (3-36) human TFA is primarily used in research to study appetite regulation and energy balance. It is known to reduce food intake by acting on specific receptors in the brain, making it a potential candidate for obesity treatment. Researchers also explore its role in gastrointestinal functions, such as slowing gastric emptying and influencing nutrient absorption. Additionally, it is investigated for its effects on insulin secretion and glucose metabolism, which may have implications for managing diabetes. Its therapeutic potential in metabolic disorders continues to be a focus of preclinical and clinical studies.