Oxytocin vs Vasopressin
Oxytocin and vasopressin are nine-amino-acid posterior-pituitary hormones that differ by two residues. Oxytocin governs labour, lactation and social bonding; vasopressin governs water retention and vascular tone.
Oxytocin
The hypothalamic nonapeptide hormone of labour and lactation, and a major research focus in social behaviour.
BEST STUDIED FOR
Nootropic & neuro
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Vasopressin
The posterior-pituitary nonapeptide that controls water balance and blood pressure, and a central regulator of social and anxiety-related behaviour.
BEST STUDIED FOR
Nootropic & neuro
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SIDE BY SIDE
| Oxytocin | Vasopressin | |
|---|---|---|
| The key difference | Bonding and uterine contraction | Water balance and blood pressure |
| Class | Nootropic & neuro | Nootropic & neuro |
| Mechanism | Oxytocin is made in the hypothalamus and released from the posterior pituitary; it contracts the uterus and triggers milk let-down. | Peripherally, AVP acts at V2 (kidney) and V1a (vascular) receptors. |
| Status | A registered prescription medicine for obstetric use. Intranasal research in autism and other conditions has produced mixed results, including a negative large trial in children with autism (2021). | Registered medicine (vasodilatory shock, diabetes insipidus); intranasal research in human social behaviour. |
| Reported safety signals | Obstetric use carries well-documented risks (uterine hyperstimulation, water intoxication at high doses). Intranasal research doses have been generally tolerated in trials. | Clinical use carries vasoconstriction and fluid-balance risks; research doses in behavioural studies are small. |
| A key study | A comprehensive review of oxytocin receptor signalling and its roles in reproduction and social behaviour. (Physiol Rev 2018, PMID 29897293) | Reviews vasopressin’s systemic antidiuretic and cardiovascular roles across species. (Biomedicines 2021, PMID 33477721) |
WHEN TO RESEARCH WHICH
They are the classic paired neurohypophyseal hormones, studied together in social-behaviour research. Both are discussed here strictly as research compounds; nothing on this page is medical advice or a dosing guide.
REFERENCES (PUBMED)
- [Oxytocin] The Oxytocin Receptor: From Intracellular Signaling to Behavior — Physiol Rev 2018. PMID 29897293
- [Oxytocin] The Social Salience Hypothesis of Oxytocin — Biol Psychiatry 2016. PMID 26321019
- [Oxytocin] Intranasal Oxytocin in Children and Adolescents with Autism Spectrum Disorder — N Engl J Med 2021. PMID 34644471
- [Vasopressin] The Biology of Vasopressin — Biomedicines 2021. PMID 33477721
- [Vasopressin] Oxytocin, Vasopressin, and Social Behavior: From Neural Circuits to Clinical Opportunities — Endocrinology 2022. PMID 35863332
- [Vasopressin] Oxytocin, vasopressin, and human social behavior — Front Neuroendocrinol 2009. PMID 19505497
FREQUENTLY ASKED
What is the difference between Oxytocin and Vasopressin?
Oxytocin and vasopressin are nine-amino-acid posterior-pituitary hormones that differ by two residues. Oxytocin governs labour, lactation and social bonding; vasopressin governs water retention and vascular tone.
What is the regulatory status of Oxytocin and Vasopressin?
Oxytocin: A registered prescription medicine for obstetric use. Intranasal research in autism and other conditions has produced mixed results, including a negative large trial in children with autism (2021). Vasopressin: Registered medicine (vasodilatory shock, diabetes insipidus); intranasal research in human social behaviour.
What safety signals have been reported?
Oxytocin: Obstetric use carries well-documented risks (uterine hyperstimulation, water intoxication at high doses). Intranasal research doses have been generally tolerated in trials. Vasopressin: Clinical use carries vasoconstriction and fluid-balance risks; research doses in behavioural studies are small.
Which studies is this comparison based on?
For Oxytocin: “The Oxytocin Receptor: From Intracellular Signaling to Behavior” (PMID 29897293); “The Social Salience Hypothesis of Oxytocin” (PMID 26321019); “Intranasal Oxytocin in Children and Adolescents with Autism Spectrum Disorder” (PMID 34644471). For Vasopressin: “The Biology of Vasopressin” (PMID 33477721); “Oxytocin, Vasopressin, and Social Behavior: From Neural Circuits to Clinical Opportunities” (PMID 35863332); “Oxytocin, vasopressin, and human social behavior” (PMID 19505497).
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