Oxytocin is a cyclic neuropeptide produced in the hypothalamus and released via the posterior pituitary that signals through the oxytocin receptor (OXTR), a G protein-coupled receptor. It functions as both a central neuromodulator and a peripheral endocrine signal. Principal research areas include social bonding and attachment neurobiology, stress-response regulation, reproductive physiology, and neuroendocrine signaling. Supplied as a lyophilized research material for laboratory research applications.