GHK-Cu
We've tested 530 samples of GHK-Cu sourced from 67 vendors between 22 Apr 2025 and 28 May 2026. Purity typically ranges from 99.60% to 99.97% (5th-95th percentile), and quantity typically diverges by up to +/-57% vs advertised value (95th percentile).
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Vendors
| Tests | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Vendor | Rating | Count | Avg | Min | Max | Oldest | Most Recent | ||
 | 9 | 4 Nov 2025 | 13 May 2026 | ||||||
 | 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 | ||||||
| 2 | 26 Apr 2026 | 26 Apr 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 | ||||||
 | 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 | ||||||
| 5 | 16 Jul 2025 | 23 Apr 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 | 26 Jan 2026 | 6 May 2026 | ||||||
| 8 | 11 Feb 2026 | 13 May 2026 | ||||||
| 11 | 17 Nov 2025 | 10 Mar 2026 | ||||||
| 6 | 6 Nov 2025 | 22 Feb 2026 | ||||||
| 8 | 17 Dec 2025 | 22 Feb 2026 | ||||||
 | 32 | 10 Jul 2025 | 13 May 2026 | ||||||
| 9 | 25 Nov 2025 | 13 May 2026 | ||||||
| 6 | 17 Dec 2025 | 13 May 2026 | ||||||
| 8 | 19 Jan 2026 | 20 May 2026 | ||||||
| 18 | 3 Oct 2025 | 6 May 2026 | ||||||
| 14 | 4 Aug 2025 | 5 May 2026 | ||||||
| 7 | 6 Jan 2026 | 23 Apr 2026 | ||||||
| 7 | 9 Oct 2025 | 28 Apr 2026 | ||||||
| 12 | 23 Oct 2025 | 27 May 2026 | ||||||
 | 9 | 4 Aug 2025 | 13 May 2026 | ||||||
| 11 | 4 Sep 2025 | 6 May 2026 | ||||||
| 6 | 23 Oct 2025 | 18 Mar 2026 | ||||||
| 5 | 11 Dec 2025 | 23 Apr 2026 | ||||||
 | 4 | 6 May 2025 | 20 May 2025 | ||||||
 | 3 | 25 Apr 2025 | 6 May 2025 | ||||||
| 5 | 20 Feb 2026 | 23 Apr 2026 | ||||||
| 4 | 10 Jul 2025 | 20 Sep 2025 | ||||||
 | 5 | 20 May 2025 | 10 Jul 2025 | ||||||
| 5 | 18 Feb 2026 | 28 Apr 2026 | ||||||
| 5 | 19 Jan 2026 | 25 Mar 2026 | ||||||
| 24 | 16 Jul 2025 | 27 May 2026 | ||||||
| 22 | 25 Sep 2025 | 18 May 2026 | ||||||
 | 5 | 22 Apr 2025 | 10 Jul 2025 | ||||||
| 5 | 6 Dec 2025 | 13 May 2026 | ||||||
| 5 | 15 Jan 2026 | 6 Mar 2026 | ||||||
| 6 | 26 Jan 2026 | 23 Apr 2026 | ||||||
| 12 | 25 Sep 2025 | 28 Apr 2026 | ||||||
 | 7 | 10 Sep 2025 | 2 Feb 2026 | ||||||
| 45 | 16 Jul 2025 | 5 May 2026 | ||||||
| 7 | 10 Jul 2025 | 6 Mar 2026 | ||||||
| 5 | 29 Oct 2025 | 6 Mar 2026 | ||||||
| 11 | 4 Aug 2025 | 5 May 2026 | ||||||
| 21 | 4 Aug 2025 | 13 May 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 | Tested | Difference | Purity | Endotoxins | Batch ID | Container | Tested At | Sent By |
| 27 May 2026 | Heman Peptide HM | View | 50mg | 32.6mg | -34.8% | 99.90% | n/a | April 7 2026 | White label / Silver crimp / Blue cap | Lab E | Public | |
| 27 May 2026 | Reta-Peptide | View | 50mg | 53.3mg | +6.6% | 99.70% | n/a | February 2, 2026 | No Label / Silver Crimp / Blue Cap | Lab E | Public | |
| 27 May 2026 | Reta-Peptide | View | 100mg | 108mg | +8.0% | 99.90% | n/a | Cu100 | No label / Silver crimp / Red cap | Lab E | Public | |
| 20 May 2026 | Shanghai ERP peptide Biotechnology | View | 50mg | 49.9mg | -0.2% | 99.50% | below LOQ | 990044 | No label / Silver crimp / Blue cap | Lab E | Public | |
| 19 May 2026 | Reta-Peptide | View | 100mg | 82.4mg | -17.6% | 99.30% | below LOQ | (no batch ID) | No label / Silver crimp / Blue cap | Lab E | Public | |
| 18 May 2026 | Heman Peptide HM | View | 50mg | 46mg | -8.0% | 99.70% | n/a | (no batch ID) | No label / Silver crimp / Blue cap | Lab G | Public | |
| 18 May 2026 | LiliPeptide | View | 50mg | 37.5mg | -25.0% | 99.80% | n/a | (no batch ID) | No label / Silver crimp / Purple 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.
- 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.