Oxytocin

Strong evidence
ClassNonapeptide hormone
Research statusFDA-approved (branded forms)
Independent tests4
Studies indexed1
Companies tested 3

Overview

A well-characterised nonapeptide hormone with approved obstetric uses and a large, contested literature on social cognition.

Oxytocin is classified as a nonapeptide hormone. Its current development status is: fda-approved (branded forms). Multiple randomised controlled trials in humans support the primary claims made for this compound.

The Peptide Institute tracks Oxytocin because it is actively sold through research-compound and telehealth channels. Our interest is narrow and specific: what is actually in the vial, whether the label is accurate, and whether the sellers of it can document what they claim. We take no position on whether anyone should use it.

Independent Testing

Independently tested companies that sell Oxytocin

Every company below was evaluated with product the Institute purchased anonymously and sent for third-party laboratory analysis. Ranked by Index Score™.

Companies
3
Samples
4
Updated
Jun 2, 2026
  1. 1 Research Peptides Co. Exceptional Institute
    Top Rated
    Oxytocin

    97.4% average purity across 1 sample

    Purity & Testing 98 Transparency 84 Samples 1 90 View company
  2. 2 Helix Research Supply Good

    97.9% average purity across 2 samples

    Purity & Testing 87 Transparency 68 Samples 2 79 View company
  3. 3 Vector Peptide Supply Good

    97.7% average purity across 1 sample

    Purity & Testing 89 Transparency 52 Samples 1 70 View company
Compare all tested Oxytocin companies

Research & Studies

Studies library
  • Long-term outcomes with Oxytocin: an open-label extension

    Journal of Clinical Endocrinology & Metabolism · Meta-analysis · Mar 10, 2021

    Adds to the Oxytocin evidence base without resolving the central question of human efficacy.

Independent Testing

Testing database

Laboratory verification of Oxytocin products across the companies we index.

Oxytocin Research Peptides Co.
Purity 97.4% Verified
Oxytocin Helix Research Supply
Purity 97.7% Verified
Oxytocin Vector Peptide Supply
Purity 97.7% Verified
Oxytocin Helix Research Supply
Purity 98.1% Verified

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