GHK-Cu
We've tested 633 samples of GHK-Cu sourced from 86 vendors between 22 Apr 2025 and 16 Jun 2026. Purity typically ranges from 99.60% to 99.95% (5th-95th percentile), and quantity typically diverges by up to +/-48% vs advertised value (95th percentile).
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Vendors
| Tests | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Vendor | Rating | Count | Avg | Min | Max | Oldest | Most Recent | ||
 | 10 | 4 Nov 2025 | 15 Jun 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 | 25 Nov 2025 | 27 May 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 | ||||||
 | 4 | 3 Oct 2025 | 26 Jan 2026 | ||||||
| 4 | 4 Mar 2026 | 13 May 2026 | ||||||
 | 4 | 25 Oct 2025 | 2 Jun 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 | ||||||
| 5 | 23 Apr 2026 | 15 Jun 2026 | ||||||
| 4 | 20 Feb 2026 | 25 May 2026 | ||||||
 | 3 | 6 Aug 2025 | 25 Nov 2025 | ||||||
 | 4 | 20 May 2025 | 10 Jul 2025 | ||||||
| 5 | 4 Aug 2025 | 1 Jun 2026 | ||||||
 | 6 | 6 May 2025 | 26 Feb 2026 | ||||||
 | 12 | 14 Aug 2025 | 15 Jun 2026 | ||||||
| 15 | 25 Nov 2025 | 23 Apr 2026 | ||||||
| 4 | 19 Jan 2026 | 20 Feb 2026 | ||||||
| 4 | 23 Oct 2025 | 21 Apr 2026 | ||||||
| 4 | 29 Dec 2025 | 6 Mar 2026 | ||||||
| 5 | 16 Jul 2025 | 29 Dec 2025 | ||||||
| 4 | 25 Nov 2025 | 11 Feb 2026 | ||||||
| 4 | 6 Jan 2026 | 12 Mar 2026 | ||||||
| 4 | 18 Feb 2026 | 10 Mar 2026 | ||||||
| 5 | 16 Jul 2025 | 26 Feb 2026 | ||||||
| 5 | 16 Jul 2025 | 23 Apr 2026 | ||||||
| 4 | 17 Dec 2025 | 26 Feb 2026 | ||||||
| 4 | 23 Oct 2025 | 17 Dec 2025 | ||||||
 | 8 | 16 Jul 2025 | 22 Feb 2026 | ||||||
| 10 | 11 Dec 2025 | 2 Jun 2026 | ||||||
| 13 | 4 Sep 2025 | 12 Jun 2026 | ||||||
| 8 | 26 Jan 2026 | 4 Jun 2026 | ||||||
| 9 | 11 Feb 2026 | 5 Jun 2026 | ||||||
| 11 | 4 Sep 2025 | 6 May 2026 | ||||||
| 11 | 17 Nov 2025 | 10 Mar 2026 | ||||||
| 6 | 6 Nov 2025 | 22 Feb 2026 | ||||||
| 8 | 17 Dec 2025 | 22 Feb 2026 | ||||||
 | 34 | 10 Jul 2025 | 8 Jun 2026 | ||||||
| 9 | 25 Nov 2025 | 13 May 2026 | ||||||
| 6 | 17 Dec 2025 | 13 May 2026 | ||||||
| 10 | 19 Jan 2026 | 12 Jun 2026 | ||||||
| 19 | 3 Oct 2025 | 8 Jun 2026 | ||||||
| 14 | 4 Aug 2025 | 5 May 2026 | ||||||
| 7 | 6 Jan 2026 | 23 Apr 2026 | ||||||
 | 9 | 4 Aug 2025 | 13 May 2026 | ||||||
| 7 | 9 Oct 2025 | 28 Apr 2026 | ||||||
| 13 | 23 Oct 2025 | 27 May 2026 | ||||||
| 6 | 19 Jan 2026 | 1 Jun 2026 | ||||||
| 6 | 23 Oct 2025 | 18 Mar 2026 | ||||||
 | 2 | 20 May 2025 | 6 Mar 2026 | ||||||
| 4 | 26 Jan 2026 | 23 Apr 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 | ||||||
 | 4 | 4 Nov 2025 | 15 Feb 2026 | ||||||
 | 2 | 16 Jul 2025 | 13 May 2026 | ||||||
| 4 | 11 Feb 2026 | 15 Jun 2026 | ||||||
| 5 | 18 Feb 2026 | 28 Apr 2026 | ||||||
| 25 | 16 Jul 2025 | 2 Jun 2026 | ||||||
| 7 | 6 Dec 2025 | 15 Jun 2026 | ||||||
| 24 | 25 Sep 2025 | 2 Jun 2026 | ||||||
 | 5 | 22 Apr 2025 | 10 Jul 2025 | ||||||
| 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 | ||||||
| 4 | 17 Dec 2025 | 6 Mar 2026 | ||||||
| 11 | 4 Aug 2025 | 5 May 2026 | ||||||
| 22 | 4 Aug 2025 | 12 Jun 2026 | ||||||
| 4 | 21 Oct 2025 | 13 May 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 |
| 15 Jun 2026 | Oupeptide | View | 100mg | 88.1mg | -11.9% | 99.90% | n/a | 03182026 | No label / Silver crimp / Violet cap | Lab E | Public | |
| 15 Jun 2026 | Lumira | View | 100mg | 96.8mg | -3.2% | 99.90% | n/a | WL-CU100-P00034 | No label / Silver crimp / Clear Blue cap | Lab E | Public | |
| 15 Jun 2026 | Shanghai Baoju | View | 100mg | 99mg | -1.0% | 99.80% | n/a | CU100032026 | Black label / Silver crimp / Red cap | Lab E | Public | |
| 15 Jun 2026 | Tianjin Eleli Technology Development | View | 50mg | 13.3mg | -73.4% | 99.90% | n/a | 89030-95-5 | No label / Silver crimp / Violet cap | Lab E | Public | |
| 15 Jun 2026 | Welon Peptide Solutions | View | 100mg | 97.8mg | -2.2% | 99.90% | n/a | (no batch ID) | No Label / Silver Crimp / Black Cap | Lab E | Public | |
| 12 Jun 2026 | Yiwu Aozuo Trading Co | View | 100mg | 94.9mg | -5.1% | 99.90% | below LOQ | March 3,2026 | No Label / Silver Crimp / No Cap | Lab E | Public | |
| 12 Jun 2026 | Shanghai ERP peptide Biotechnology | View | 50mg | 51.3mg | +2.6% | 99.90% | low | 121480 | (no data) | Lab E | Public | |
Corrections
- 30 May 2026: Nexaph
- Sample wu24pm7 was submitted with an incorrect declared potency of 50 mg. The requester later confirmed that a submission error had occurred. Following review of the associated purchase order, the intended potency was determined to be 100 mg, which is more consistent with the laboratory results obtained for this sample.
- 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.