The social bonding neuropeptide with wide-ranging effects on trust, stress, metabolism, and gut function.
Binds oxytocin receptors (OXTRs) distributed throughout the brain (amygdala, hypothalamus, nucleus accumbens), gut, and periphery. In the brain reduces amygdala fear response, increases trust and social approach behaviour, and suppresses HPA-axis cortisol release. Peripherally modulates gut motility and insulin sensitivity.
Oxytocin's role extends far beyond childbirth and breastfeeding. Nasal oxytocin is studied extensively for autism, social phobia, PTSD, and borderline personality disorder. Results have been mixed in large trials but continue to generate research interest.
There is growing evidence that gut-produced oxytocin plays a role in insulin sensitivity and metabolic regulation, creating research interest at the intersection of social neuroscience and metabolic medicine.