GHK-Cu
We've tested 463 samples of GHK-Cu sourced from 58 vendors between 22 Apr 2025 and 6 May 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 | 4 Nov 2025 | 5 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 | ||||||
 | 4 | 6 May 2025 | 20 May 2025 | ||||||
| 2 | 26 Apr 2026 | 26 Apr 2026 | ||||||
 | 2 | 6 May 2025 | 6 May 2025 | ||||||
 | 2 | 10 Jul 2025 | 10 Jul 2025 | ||||||
| 3 | 17 Nov 2025 | 10 Mar 2026 | ||||||
 | 3 | 25 Oct 2025 | 23 Apr 2026 | ||||||
 | 2 | 29 Mar 2026 | 29 Mar 2026 | ||||||
| 4 | 15 Jan 2026 | 22 Feb 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 | ||||||
| 7 | 11 Feb 2026 | 2 Apr 2026 | ||||||
| 6 | 26 Jan 2026 | 28 Apr 2026 | ||||||
| 10 | 4 Sep 2025 | 2 Mar 2026 | ||||||
| 11 | 17 Nov 2025 | 10 Mar 2026 | ||||||
 | 31 | 10 Jul 2025 | 18 Mar 2026 | ||||||
| 21 | 16 Jul 2025 | 5 May 2026 | ||||||
| 8 | 25 Nov 2025 | 9 Feb 2026 | ||||||
| 8 | 17 Dec 2025 | 22 Feb 2026 | ||||||
| 6 | 6 Nov 2025 | 22 Feb 2026 | ||||||
| 7 | 19 Jan 2026 | 16 Mar 2026 | ||||||
| 17 | 3 Oct 2025 | 28 Apr 2026 | ||||||
| 14 | 4 Aug 2025 | 5 May 2026 | ||||||
| 7 | 6 Jan 2026 | 23 Apr 2026 | ||||||
 | 7 | 4 Aug 2025 | 5 May 2026 | ||||||
| 7 | 9 Oct 2025 | 28 Apr 2026 | ||||||
| 6 | 23 Oct 2025 | 18 Mar 2026 | ||||||
| 4 | 10 Jul 2025 | 20 Sep 2025 | ||||||
 | 4 | 6 May 2025 | 20 May 2025 | ||||||
 | 3 | 25 Apr 2025 | 6 May 2025 | ||||||
 | 5 | 20 May 2025 | 10 Jul 2025 | ||||||
| 21 | 25 Sep 2025 | 28 Apr 2026 | ||||||
 | 5 | 22 Apr 2025 | 10 Jul 2025 | ||||||
| 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 | ||||||
| 11 | 4 Aug 2025 | 5 May 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 | Tested | Difference | Purity | Batch ID | Container | Tested At | Sent By |
| 5 May 2026 | HK Peptides | View | 50mg | 52.8mg | +5.6% | 99.70% | (no batch ID) | No Label / Silver Crimp / White Cap | Lab E | Public | |
| 5 May 2026 | Reta-Peptide | View | 100mg | 99.9mg | -0.1% | 99.90% | Feb 1, 2026 | No Label / Silver Crimp / Red Cap | Lab E | Public | |
| 5 May 2026⚠️ | Shanghai Sigma Audley SSA | View | 100mg | 77mg | -23.0% | 99.90% | (no batch ID) | No Label / Gold Crimp / Clear Cap | Lab E | Public | |
| 5 May 2026 | HK Peptides | View | 100mg | 126mg | +26.0% | 99.90% | (no batch ID) | No Label / Silver Crimp / Clear Cap | Lab E | Public | |
| 5 May 2026 | HK Peptides | View | 50mg | 59.2mg | +18.4% | 99.90% | (no batch ID) | No Label / Copper Crimp / Clear Cap | Lab E | Public | |
| 5 May 2026 | Shanghai Baoju | View | 50mg | 55.4mg | +10.8% | 99.90% | (no batch ID) | No Label / Silver Crimp / White Cap | Lab E | Public | |
| 5 May 2026 | ZLZ Peptide | View | 50mg | 44mg | -12.0% | 99.80% | 531226G | Clear 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.