GHK-Cu
We've tested 423 samples of GHK-Cu sourced from 54 vendors between 22 Apr 2025 and 23 Apr 2026. Purity typically ranges from 99.60% to 99.97% (5th-95th percentile), and quantity typically diverges by up to +/-45% vs advertised value (95th percentile).
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Vendors
| Tests | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Vendor | Rating | Count | Avg | Min | Max | Oldest | Most Recent | ||
 | 6 | 14 Jun 2025 | 11 Aug 2025 | ||||||
 | 2 | 6 May 2025 | 6 May 2025 | ||||||
 | 3 | 6 Dec 2025 | 11 Feb 2026 | ||||||
| 2 | 6 Jan 2026 | 7 Mar 2026 | ||||||
 | 4 | 6 May 2025 | 20 May 2025 | ||||||
 | 2 | 10 Jul 2025 | 10 Jul 2025 | ||||||
 | 2 | 6 May 2025 | 6 May 2025 | ||||||
| 3 | 17 Nov 2025 | 10 Mar 2026 | ||||||
 | 3 | 25 Oct 2025 | 23 Apr 2026 | ||||||
| 4 | 15 Jan 2026 | 22 Feb 2026 | ||||||
 | 2 | 29 Mar 2026 | 29 Mar 2026 | ||||||
 | 4 | 6 May 2025 | 10 Jul 2025 | ||||||
 | 4 | 14 Jun 2025 | 6 Dec 2025 | ||||||
 | 3 | 6 Aug 2025 | 25 Nov 2025 | ||||||
 | 4 | 20 May 2025 | 10 Jul 2025 | ||||||
| 8 | 23 Oct 2025 | 21 Mar 2026 | ||||||
 | 9 | 14 Aug 2025 | 12 Mar 2026 | ||||||
 | 6 | 6 May 2025 | 26 Feb 2026 | ||||||
| 15 | 25 Nov 2025 | 23 Apr 2026 | ||||||
| 5 | 16 Jul 2025 | 26 Feb 2026 | ||||||
| 4 | 23 Oct 2025 | 17 Dec 2025 | ||||||
 | 8 | 16 Jul 2025 | 22 Feb 2026 | ||||||
| 9 | 11 Dec 2025 | 6 Mar 2026 | ||||||
| 12 | 4 Sep 2025 | 21 Mar 2026 | ||||||
| 7 | 11 Feb 2026 | 2 Apr 2026 | ||||||
| 10 | 4 Sep 2025 | 2 Mar 2026 | ||||||
| 11 | 17 Nov 2025 | 10 Mar 2026 | ||||||
| 6 | 6 Nov 2025 | 22 Feb 2026 | ||||||
| 8 | 17 Dec 2025 | 22 Feb 2026 | ||||||
 | 31 | 10 Jul 2025 | 18 Mar 2026 | ||||||
| 19 | 16 Jul 2025 | 23 Apr 2026 | ||||||
| 8 | 25 Nov 2025 | 9 Feb 2026 | ||||||
| 7 | 19 Jan 2026 | 16 Mar 2026 | ||||||
| 14 | 3 Oct 2025 | 10 Mar 2026 | ||||||
| 12 | 4 Aug 2025 | 23 Apr 2026 | ||||||
| 7 | 6 Jan 2026 | 23 Apr 2026 | ||||||
| 6 | 9 Oct 2025 | 4 Mar 2026 | ||||||
| 6 | 23 Oct 2025 | 18 Mar 2026 | ||||||
 | 4 | 6 May 2025 | 20 May 2025 | ||||||
 | 3 | 25 Apr 2025 | 6 May 2025 | ||||||
| 4 | 10 Jul 2025 | 20 Sep 2025 | ||||||
 | 5 | 20 May 2025 | 10 Jul 2025 | ||||||
 | 5 | 4 Aug 2025 | 2 Feb 2026 | ||||||
| 20 | 25 Sep 2025 | 21 Mar 2026 | ||||||
 | 5 | 22 Apr 2025 | 10 Jul 2025 | ||||||
| 10 | 25 Sep 2025 | 2 Mar 2026 | ||||||
 | 7 | 10 Sep 2025 | 2 Feb 2026 | ||||||
| 40 | 16 Jul 2025 | 29 Mar 2026 | ||||||
| 7 | 10 Jul 2025 | 6 Mar 2026 | ||||||
| 10 | 4 Aug 2025 | 20 Feb 2026 | ||||||
| 20 | 4 Aug 2025 | 18 Mar 2026 | ||||||
 | 1 | 16 Jul 2025 | 16 Jul 2025 | ||||||
 | 1 | 20 May 2025 | 20 May 2025 | ||||||
| 1 | 7 Mar 2026 | 7 Mar 2026 | ||||||
Most recent GHK-Cu tests
Samples are tested in commercial labs
| Quantity | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Test Date | Vendor | Certificate | Test Score | Label | Batch | Tested | Difference | Purity | Endotoxins | Batch ID | Container | Tested At | Sent By |
| 23 Apr 2026 | Orbitrex Peptides | View | 50mg | 50.4mg | 56.5mg | +12.2% | 99.90% | below LOQ | GHK50326 | Black Label / Silver Crimp / White Cap | Lab E | Public | |
| 23 Apr 2026 | ZLZ Peptide | View | 100mg | (no batch claim) | 121mg | +21.0% | 99.90% | n/a | 2026-09-03 | White Label / Silver Crimp / Clear Cap | Lab E | Public | |
| 23 Apr 2026 | Huayi Biotechnology | View | 50mg | (no batch claim) | 43.1mg | -13.8% | 99.90% | n/a | (no batch ID) | Orange Label / Silver Crimp / Violet Cap | Lab E | Public | |
| 23 Apr 2026 | Yimei | View | 100mg | (no batch claim) | 92.5mg | -7.5% | 99.90% | n/a | (no batch ID) | No Label / Copper Crimp / Clear Cap | Lab E | Public | |
| 23 Apr 2026 | Reta-Peptide | View | 50mg | (no batch claim) | 49.9mg | -0.2% | 99.90% | n/a | Feb 1, 2026 | No Label / Silver Crimp / Blue Cap | Lab E | Public | |
| 2 Apr 2026 | Shanghai Leader Peptide Biotechnology | View | 100mg | (no batch claim) | 86.9mg | -13.1% | 99.40% | n/a | 0317260001 | No Label / Silver Crimp / Black Cap | Lab G | Public | |
| 29 Mar 2026 | Coffee and Peppers | View | 50mg | (no batch claim) | 41.6mg | -16.8% | 99.70% | n/a | CPGHK5026020601 | Silver Label / Silver Crimp / Clear Cap | Lab G | Vendor | |
Corrections
- 17 Nov 2025: Peptide Sciences
- Test results for sample rkh8jub were published from 31 Oct to 17 Nov 2025, but did not belong to Peptide Sciences: the sample was misidentified, and re-attributed to the correct vendor.
- 31 Jul 2025: Peptidology
- Peptidology ratings for GHK-Cu were updated from B to A, after taking into account the Batch IDs that are included on vials, but were initially not identified by Finnrick.
- 10 Jul 2025:
- Lab E tests published 10 Jul 2025: change in testing and analysis methodology on 15 GHK-Cu tests previously published in May and June. New COAs were issued by the lab, and test scores have been updated.
Launch with Finnrick
Some of the samples listed on this page were submitted by their vendor, as part of the Launch with Finnrick vendor support program.
The program is designed to help vendors get listed on the Finnrick web site while protecting the integrity of our rating system.
The vendor submitted four samples per product, two of which were tested by Finnrick for identity, purity and quantity according to our usual process. The vials were anonymized before being sent to the testing lab.