Oxytocin
Nonapeptide researched for social bonding, stress reduction, and neuroendocrine modulation
Half-life
~3 min
Typical Dose
10-40 IU intranasal
Format
Nasal
Purity
≥98%
Overview
Oxytocin is an endogenous nonapeptide produced by the hypothalamus and released by the posterior pituitary. Best known for its role in parturition and lactation, it has been researched extensively for social cognition, pair bonding, attachment, stress response, and in therapeutic contexts such as autism spectrum research. Intranasal administration is the most common research route for central effects, as peripheral injection produces primarily reproductive/smooth muscle effects.
Mechanism
Binds oxytocin receptors (OXTR) distributed throughout the brain, most densely in the amygdala, nucleus accumbens, hypothalamus, and prefrontal cortex. Intranasal administration allows partial central delivery via the olfactory and trigeminal routes. Effects include modulation of amygdala reactivity to social stimuli, attenuation of HPA axis stress response, and engagement of reward circuits linked to social behavior.
Researched benefits
- Social bonding and attachment research
- Stress reduction and cortisol attenuation
- Anxiety research (pro-social contexts)
- Neuroendocrine modulation
- Intimacy and relationship research
- Autism spectrum research tool
Frequently asked
Why intranasal instead of injection?
Oxytocin is a large, charged molecule that crosses the blood-brain barrier poorly when injected peripherally. Intranasal delivery allows a fraction of the dose to reach the CNS via olfactory and trigeminal routes, which is why nearly all research on central/behavioral effects uses the intranasal route. Injectable oxytocin is primarily used for peripheral (e.g. obstetric) applications.
What's the typical research dose?
Published social cognition studies typically use 24 IU intranasal as a single dose, with a range of 10-40 IU across protocols. Effects on social and stress endpoints are generally measured 30-90 minutes post-administration, corresponding to peak CNS uptake.
Can oxytocin be combined with PT-141?
They target different pathways: PT-141 acts via central melanocortin receptors to drive arousal, while oxytocin modulates social bonding and attachment circuitry. Researchers investigating intimacy-related endpoints have explored the combination, though published data on the pairing are limited.
How should oxytocin be stored?
Oxytocin should be stored refrigerated at 2-8°C and never frozen — freeze-thaw cycles degrade the peptide. Reconstituted product is stable for weeks under proper refrigeration but is best used promptly to preserve potency.
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