GHK-Cu
We've tested 442 samples of GHK-Cu sourced from 55 vendors between 22 Apr 2025 and 28 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 | ||||||
 | 6 | 6 May 2025 | 26 Feb 2026 | ||||||
 | 10 | 14 Aug 2025 | 28 Apr 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 | ||||||
| 6 | 26 Jan 2026 | 28 Apr 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 | ||||||
| 20 | 16 Jul 2025 | 28 Apr 2026 | ||||||
| 8 | 25 Nov 2025 | 9 Feb 2026 | ||||||
| 7 | 19 Jan 2026 | 16 Mar 2026 | ||||||
| 17 | 3 Oct 2025 | 28 Apr 2026 | ||||||
| 13 | 4 Aug 2025 | 28 Apr 2026 | ||||||
| 7 | 6 Jan 2026 | 23 Apr 2026 | ||||||
 | 6 | 4 Aug 2025 | 28 Apr 2026 | ||||||
| 7 | 9 Oct 2025 | 28 Apr 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 | ||||||
| 21 | 25 Sep 2025 | 28 Apr 2026 | ||||||
 | 5 | 22 Apr 2025 | 10 Jul 2025 | ||||||
| 12 | 25 Sep 2025 | 28 Apr 2026 | ||||||
 | 7 | 10 Sep 2025 | 2 Feb 2026 | ||||||
| 42 | 16 Jul 2025 | 28 Apr 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 | Batch ID | Container | Tested At | Sent By |
| 28 Apr 2026 | HK Peptides | View | 100mg | (no batch claim) | 110.5mg | +10.5% | 99.90% | (no batch ID) | No Label / Silver Crimp / Violet Cap | Lab E | Public | |
| 28 Apr 2026 | Nexaph | View | 50mg | 56.2mg | 57.8mg | +2.8% | 99.90% | GHK5010032025-08 | No Label / Copper Crimp / Violet Cap | Lab E | Public | |
| 28 Apr 2026 | Tianjin Ruiwang New Material Technology Co | View | 50mg | (no batch claim) | 47.3mg | -5.4% | 99.90% | 12-30- 2025 | White Label / Silver Crimp / White Cap | Lab E | Public | |
| 28 Apr 2026 | Oupeptide | View | 100mg | (no batch claim) | 81mg | -19.0% | 99.90% | (no batch ID) | No Label / Silver Crimp / Violet Cap | Lab E | Public | |
| 28 Apr 2026 | Lisa Biopeptide | View | 50mg | (no batch claim) | 61.5mg | +23.0% | 99.90% | (no batch ID) | No Label / Copper Crimp / Clear Cap | Lab E | Public | |
| 28 Apr 2026 | HK Peptides | View | 50mg | (no batch claim) | 79.4mg | +58.8% | 99.70% | (no batch ID) | Blue Label / Silver Crimp / Blue Cap | Lab E | Public | |
| 28 Apr 2026 | Shanxi Qianyecao Biotech QYC | View | 50mg | (no batch claim) | 45.9mg | -8.2% | 99.90% | CU501142026 | White Label / Silver Crimp / White Cap | Lab E | 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.
- 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.