Neuropeptide Y Fragment 3-36 (human, rat) is primarily utilized in research settings to study its role in modulating appetite and energy balance. It acts as a selective agonist for certain Y receptors, making it valuable in understanding feeding behavior and metabolic regulation. This fragment is often employed in experimental models to investigate its potential therapeutic applications in conditions like obesity, diabetes, and eating disorders. Additionally, it is used in neuroscience studies to explore its effects on stress responses, anxiety, and mood regulation, given its influence on the central nervous system. Its application extends to pharmacological research aimed at developing drugs targeting neuropeptide Y receptors for various metabolic and neurological disorders.