Oxytocin
★ 65 FDA approvedOxytocin (cyclic nonapeptide)
Social bonding and intimacy peptide
Sexual HealthAbout
Oxytocin is a 9-amino-acid cyclic peptide hormone produced in the hypothalamus and released by the posterior pituitary. Approved by the FDA in IV/IM form for obstetric use only (labor induction, postpartum hemorrhage, milk let-down). Off-label research interest centers on intranasal use for social cognition, bonding, anxiety, and sexual function, though large trials have produced mostly null results.
Mechanism
Binds the oxytocin receptor (a Gq-coupled GPCR) in the CNS and peripheral tissues, modulating amygdala reactivity, prosocial behavior, smooth-muscle contraction, and reward circuitry.
Dosage
beginner
- Amount
- 10-24 IU
- Frequency
- Once daily
- Route
- Intranasal
- Duration
- 1-2 weeks
standard
- Amount
- 24-48 IU
- Frequency
- Twice daily (split)
- Route
- Intranasal
- Duration
- 4-6 weeks
advanced
- Amount
- Up to 72 IU
- Frequency
- Once or twice daily
- Route
- Intranasal
- Duration
- 4-6 weeks
Dose 30-60 minutes before the targeted social context. Effects on behavioral endpoints typically measured 30-90 minutes post-administration.
Standard cycle is 4-6 weeks on followed by 1-2 weeks off. Tolerance and receptor downregulation are theoretical concerns with daily long-term use.
Reconstitution & Storage
For intranasal use, transfer reconstituted solution to a metered nasal spray bottle; 10 units on a U-100 syringe ≈ 50 IU.
Dosing reference — units to draw
Concentration = peptide mass ÷ bacteriostatic water; units to draw = dose volume (mL) × 100 on a U-100 insulin syringe. Each vial size below is shown at 1 mL, with the units to draw for a typical 250–500 mcg dose.
| Vial | BAC water | Concentration | Units to draw |
|---|---|---|---|
| 5 mg | 1 mL | 5000 mcg/mL | 5–10 units |
| 10 mg | 1 mL | 10000 mcg/mL | 2.5–5 units |
Lyophilized: -20°C long-term. Reconstituted: 2-8°C, use within 2-4 weeks. Discard if cloudy. Do not freeze reconstituted.
Benefits
- • Possible enhancement of social attention and trust (mixed evidence)
- • Reported increase in feelings of bonding and intimacy
- • Approved efficacy for labor induction and postpartum hemorrhage
- • Anxiolytic effects reported in some small studies
Side effects
- • Nasal irritation and sneezing (intranasal)
- • Transient headache
- • Irritability or emotional blunting at higher doses
- • Hyponatremia and water intoxication (high IV doses)
- • Uterine hyperstimulation (obstetric IV use)
Contraindications
- • Pregnancy outside hospital obstetric protocols
- • Cardiovascular disease and arrhythmias
- • Hyponatremia
- • Concurrent lithium or prostaglandin analogues
- • Children and adolescents (SOARS-B showed no benefit)
- • Hypersensitivity to oxytocin or preservatives
Gender notes
Men
Reported effects on partner bonding, empathy, and reduced amygdala reactivity in social tasks.
Women
Effects can vary across the menstrual cycle. Avoid entirely if pregnant or attempting pregnancy outside clinical supervision.
Research
- Intranasal Oxytocin in Children and Adolescents with Autism Spectrum Disorder ↗
SOARS-B, the largest RCT (n=290), found no significant difference between intranasal oxytocin (up to 48 IU/day for 24 weeks) and placebo on social withdrawal or any secondary social endpoint.
New England Journal of Medicine · 2021
- Oxytocin enhances amygdala-dependent, socially reinforced learning ↗
Single-dose intranasal oxytocin modulated amygdala responses and trust behavior in healthy adults, supporting a CNS-relevant pharmacology despite limited bioavailability.
Journal of Neuroscience · 2008
- Intranasal oxytocin versus placebo for hypoactive sexual desire disorder in women ↗
Small RCTs of intranasal oxytocin for sexual desire have shown modest or null effects on arousal and orgasm endpoints versus placebo.
Fertility and Sterility · 2017
Stacks well with
Oxytocin FAQ
How do you reconstitute Oxytocin?
Add 1 mL of bacteriostatic water to a 5 mg vial of Oxytocin, which gives a concentration of 5000 mcg/mL. Inject the water slowly down the vial wall and swirl gently — never shake.
What is a typical Oxytocin dose?
A typical research dose of Oxytocin is 250–500 mcg, twice daily (split). This is educational information, not medical advice.
How many units of Oxytocin do I draw?
From a 5 mg vial reconstituted with 1 mL of bacteriostatic water, draw 5–10 units on a U-100 insulin syringe for a 250–500 mcg dose.
Track Oxytocin doses in the app
Built-in reconstitution calculator, dose log, and reminders. Free on Android.
Get on Google PlayEducational use only. Not medical advice. Many peptides shown are not FDA-approved and remain research compounds. Always consult a qualified healthcare provider.