GHK-Cu
We've tested 338 samples of GHK-Cu sourced from 44 vendors between 22 Apr 2025 and 7 Mar 2026. Purity typically ranges from 99.60% to 99.98% (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 | ||
 | 10 | 4 Aug 2025 | 20 Feb 2026 | ||||||
 | 6 | 14 Jun 2025 | 11 Aug 2025 | ||||||
 | 2 | 6 May 2025 | 6 May 2025 | ||||||
 | 2 | 25 Oct 2025 | 27 Oct 2025 | ||||||
| 3 | 6 Dec 2025 | 11 Feb 2026 | ||||||
| 4 | 23 Oct 2025 | 29 Dec 2025 | ||||||
 | 4 | 6 May 2025 | 20 May 2025 | ||||||
 | 2 | 10 Jul 2025 | 10 Jul 2025 | ||||||
 | 2 | 6 May 2025 | 6 May 2025 | ||||||
 | 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 | 14 Aug 2025 | 18 Feb 2026 | ||||||
 | 6 | 6 May 2025 | 26 Feb 2026 | ||||||
| 13 | 25 Nov 2025 | 4 Mar 2026 | ||||||
| 5 | 16 Jul 2025 | 26 Feb 2026 | ||||||
| 4 | 23 Oct 2025 | 17 Dec 2025 | ||||||
 | 8 | 16 Jul 2025 | 22 Feb 2026 | ||||||
| 9 | 4 Sep 2025 | 7 Mar 2026 | ||||||
| 8 | 4 Sep 2025 | 4 Nov 2025 | ||||||
| 10 | 17 Nov 2025 | 20 Feb 2026 | ||||||
| 6 | 6 Nov 2025 | 22 Feb 2026 | ||||||
| 8 | 17 Dec 2025 | 22 Feb 2026 | ||||||
 | 27 | 10 Jul 2025 | 4 Mar 2026 | ||||||
| 18 | 16 Jul 2025 | 4 Mar 2026 | ||||||
| 18 | 4 Aug 2025 | 10 Feb 2026 | ||||||
| 8 | 25 Nov 2025 | 9 Feb 2026 | ||||||
| 17 | 25 Sep 2025 | 1 Mar 2026 | ||||||
| 12 | 3 Oct 2025 | 11 Feb 2026 | ||||||
| 9 | 4 Aug 2025 | 19 Jan 2026 | ||||||
| 6 | 9 Oct 2025 | 4 Mar 2026 | ||||||
| 6 | 10 Jul 2025 | 13 Feb 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 | ||||||
 | 5 | 22 Apr 2025 | 10 Jul 2025 | ||||||
| 8 | 25 Sep 2025 | 22 Feb 2026 | ||||||
 | 7 | 10 Sep 2025 | 2 Feb 2026 | ||||||
| 34 | 16 Jul 2025 | 26 Feb 2026 | ||||||
 | 1 | 16 Jul 2025 | 16 Jul 2025 | ||||||
| 1 | 7 Mar 2026 | 7 Mar 2026 | ||||||
| 1 | 7 Mar 2026 | 7 Mar 2026 | ||||||
 | 1 | 20 May 2025 | 20 May 2025 | ||||||
| 1 | 4 Mar 2026 | 4 Mar 2026 | ||||||
| 1 | 7 Mar 2026 | 7 Mar 2026 | ||||||
| 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 | Tested | Difference | Purity | Endotoxins | Batch ID | Container | Tested At | Sent By |
| 7 Mar 2026 | Yiwu Aozuo Trading Co | View | 50mg | 47.3mg | -5.4% | 99.60% | n/a | (no batch ID) | No Label / Silver Crimp / Blue Cap | Lab G | Public | |
| 4 Mar 2026 | Yimei | View | 50mg | 58mg | +16.0% | 99.70% | n/a | (no batch ID) | No Label / Silver Crimp / Clear Cap | Lab G | Public | |
| 4 Mar 2026 | Qing Li Peptide | View | 50mg | 48.5mg | -3.0% | 99.70% | n/a | Jan 6, 2026 | No Label / Silver Crimp / Blue Cap | Lab G | Public | |
| 4 Mar 2026 | Uther | View | 50mg | 27.7mg | -44.6% | 99.70% | n/a | (no batch ID) | No Label / Silver Crimp / White Cap | Lab G | Public | |
| 4 Mar 2026 | Reta-Peptide | View | 100mg | 111.2mg | +11.2% | 99.60% | n/a | (no batch ID) | No Label / Silver Crimp / Red Cap | Lab G | Public | |
| 2 Mar 2026 | Yimei | View | 50mg | 44.2mg | +2.6% | 99.90% | below LOQ | (no batch ID) | No Label / Silver Crimp / Clear Cap | Lab E | Public | |
| 1 Mar 2026 | LiliPeptide | View | 100mg | 93.4mg | -6.6% | 99.60% | n/a | (no batch ID) | No Label / Silver Crimp / Blue Cap | Lab G | Public | |
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.
- 11 Nov 2025: Peptide Powder Home
- The sample was misslabaled by the requester, actual quantity for this sample is 50 mg, Quantity has been edited with correct value (previus value was 5 mg) and a new lab result.
- 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.