The Peptide Index™

Best Oxytocin companies

3 companies evaluated using 4 samples the Institute purchased anonymously and sent for independent laboratory analysis. Ranked by Index Score™.

Updated 4 samples tested How we rank →
Institute
Top Rated Oxytocin

Ranked #1 of 3

Research Peptides Co.

Established supplier with strong purity results and improving transparency practices.

  • 97.4% average purity across 1 sample
  • 99.5% average content accuracy vs. label
  • Most recent sample tested Jun 2, 2026
View full profile Read the lab report
90 Exceptional 90–100

Full Oxytocin rankings

Scoring methodology →
Rank Company Index Score™ Purity & TestingProduct AccuracyTransparencyFulfillmentCustomer ExperienceValue Samples
1 Research Peptides Co. Exceptional 90 989184869088 1
2 Helix Research Supply Good 79 877368848278 2
3 Vector Peptide Supply Good 70 896652746866 1

Scores combine six weighted dimensions: Purity & Testing (25%), Product Accuracy (20%), Transparency (20%), Fulfillment (15%), Customer Experience (10%), Value (10%). A company appears here only if the Institute has independently tested Oxytocin purchased from it.

Oxytocin researchEvidence, mechanism, dosage research and studies Testing databaseEvery published lab report, with full methodology All rankingsOverall and category leaders across the Index

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