The Peptide Index™

Best GHK-Cu companies

4 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 GHK-Cu

Ranked #1 of 4

PureSci Labs

Quality-focused supplier with excellent manufacturing disclosure and moderate catalog depth.

  • 98.8% average purity across 1 sample
  • 100.8% average content accuracy vs. label
  • Most recent sample tested Oct 13, 2025
View full profile Read the lab report
89 Excellent 80–89

Full GHK-Cu rankings

Scoring methodology →
Rank Company Index Score™ Purity & TestingProduct AccuracyTransparencyFulfillmentCustomer ExperienceValue Samples
1 PureSci Labs Excellent 89 999295768078 1
2 Halcyon Biosciences Excellent 89 998690878678 1
3 Sterling Compound Co. Good 74 916766766268 1
4 Cascade Research Group Below Standard 35 93138625444 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 GHK-Cu purchased from it.

GHK-Cu 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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