Oxytocin
From PeptidePlaza, the free peptide reference · Entry #027 · Nootropic · Hand-curated entry · Editorial standards
Oxytocin (also known as OT, Pitocin (synthetic), Oxt) is a nootropic research peptide. A nine-amino-acid neuropeptide hormone best known for childbirth and lactation, now studied extensively for social bonding, stress regulation, wound healing, and metabolic effects via intranasal delivery.
Oxytocin is a nine-amino-acid peptide hormone synthesized in the hypothalamus and released from the posterior pituitary. It is classically known for uterine contraction during labor and milk ejection during lactation (synthetic oxytocin, Pitocin, is FDA-approved for these indications). Over the past two decades it has become one of the most studied neuropeptides in behavioral science, with intranasal oxytocin investigated for social bonding, trust, anxiety, stress regulation, and psychiatric applications. More recent research has examined its roles in wound healing, obesity and metabolism, and neuroprotection after brain injury.
1 Mechanism of action
Activates the oxytocin receptor (OXTR), a Gq-coupled GPCR, modulating calcium signaling in uterine myocytes, mammary tissue, and multiple brain regions (amygdala, nucleus accumbens, hypothalamus). Modulates social salience, stress axis (HPA) activity, and peripheral physiology.
Primary targets: OXTR
2 Reported effects
Effects below are those reported in the published literature cited on this page. They are not claims of clinical benefit and not medical advice.
2.1 Reported benefits
- Reduces cortisol response to psychosocial stress in studies
- Enhances social bonding and trust behaviors (context-dependent)
- Accelerates wound healing in animal models
- Studied for obesity, Prader-Willi syndrome, and neuroprotection
2.2 Side effects
- Nasal irritation (intranasal route)
- Headache or dizziness
- Uterine contractions (pregnancy contraindication)
- Fluid retention at high doses
3 Chemical and physical properties
| CAS number | 50-56-6 |
|---|---|
| Molar mass | 1007.2 g/mol |
| Purity (typical) | >99% |
| Half-life | ~3–5 minutes (IV); intranasal effects longer-lasting |
| Storage | −20 °C, lyophilised powder, desiccated |
| Solubility | Sterile water / bacteriostatic water |
| Receptors / targets | OXTR |
3.1 Amino acid sequence
Cys-Tyr-Ile-Gln-Asn-Cys-Pro-Leu-Gly-NH2 (disulfide bridge Cys1-Cys6)
4 Research dosages
24–48 IU intranasal in behavioral studies; 1–3 IU IV/min titrated in obstetric use.
5 Research studies (3)
- Social support and oxytocin interact to suppress cortisol and subjective responses to psychosocial stress.
Biological psychiatry (2003) · ReviewBACKGROUND: The presence of social support has been associated with decreased stress responsiveness. - Intranasal Oxytocin for Obesity.
NEJM evidence (2024) · ReviewBACKGROUND: Accumulating preclinical and preliminary translational evidence shows that the hypothalamic peptide oxytocin reduces food intake, increases energy expenditure, and promotes weight loss. - A Pilot Randomized Clinical Trial of Intranasal Oxytocin to Promote Weight Loss in Individuals With Hypothalamic Obesity.
Journal of the Endocrine Society (2023) · ReviewCONTEXT: Hypothalamic obesity is a rare, treatment-resistant form of obesity.
6 Safety and risk profile
6.1 Regulatory status
Oxytocin is currently classified as FDA approved. Approval applies to specific clinical indications and dosing; research-grade material is not the approved product.
Safety score: 68/100 — moderate concern. Derived from clinical data volume, known risks and regulatory status.
6.2 Contraindications
Conditions and populations in which use is contraindicated:
- Pregnancy (uterine contraction risk)
- Known hypersensitivity
- Severe cardiovascular conditions
6.3 Drug interactions
| Drug or class | Interaction | Risk |
|---|---|---|
| Prostaglandins | Synergistic uterine stimulation — avoid in pregnancy protocols. | High |
| Corticosteroids | Oxytocin may interact with stress-axis modulation. | Low |
6.4 Long-term risks
- Chronic intranasal use effects not well characterized
- Context-dependent psychological effects
- Fluid retention with systemic dosing
6.5 Research best practices
- Store lyophilized at −20 °C
- Reconstitute with saline for intranasal or injection research
- Administer in controlled, low-stress environments to reduce confounds
7 Frequently asked questions
- Why is oxytocin called the "love hormone"?
- Intranasal oxytocin research shows it increases trust, eye contact, and social bonding behaviors, though effects are context-dependent and more modest than popular media suggests.
- Is oxytocin available as a drug?
- Yes — synthetic oxytocin (Pitocin) is FDA-approved for labor induction and postpartum hemorrhage. Intranasal oxytocin for psychiatric or metabolic uses is off-label research.
- How is it typically administered in research?
- Behavioral studies almost exclusively use intranasal sprays (24–48 IU). IV dosing is used in obstetric and endocrine research. Effects on social behavior are usually studied 30–60 minutes after administration.
8 References
- Social support and oxytocin interact to suppress cortisol and subjective responses to psychosocial stress. PubMed (2003). Heinrichs M, et al.. View source
- Oxytocin Improves Intracerebral Hemorrhage Outcomes by Suppressing Neuronal Pyroptosis and Mitochondrial Fission. PubMed (2023). Yang M, et al.. View source
- Improving the precision of intranasal oxytocin research. PubMed (2021). Winterton A, et al.. View source
- The efficacy of intranasal oxytocin in patients with Prader-Willi syndrome: A systematic review and meta-analysis. PubMed (2023). Shalma NM, et al.. View source
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