GHK-Cu
We've tested 134 samples of GHK-Cu sourced from 27 vendors between 22 Apr 2025 and 17 Nov 2025. Purity varies from 99.32% to 100.00%, and quantity can diverge by up to +/-120% vs advertised value.
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Vendors
| Tests | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Vendor | Rating | Count | Avg | Min | Max | Oldest | Most Recent | ||
 | 8 | 4 Aug 2025 | 7 Nov 2025 | ||||||
 | 6 | 14 Jun 2025 | 11 Aug 2025 | ||||||
 | 2 | 6 May 2025 | 6 May 2025 | ||||||
| 2 | 25 Oct 2025 | 27 Oct 2025 | ||||||
 | 4 | 6 May 2025 | 20 May 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 | ||||||
 | 3 | 14 Jun 2025 | 10 Jul 2025 | ||||||
 | 2 | 6 Aug 2025 | 7 Nov 2025 | ||||||
 | 4 | 20 May 2025 | 10 Jul 2025 | ||||||
| 5 | 4 Aug 2025 | 17 Nov 2025 | ||||||
| 4 | 16 Jul 2025 | 4 Aug 2025 | ||||||
 | 7 | 16 Jul 2025 | 7 Nov 2025 | ||||||
 | 18 | 10 Jul 2025 | 17 Nov 2025 | ||||||
| 11 | 16 Jul 2025 | 4 Nov 2025 | ||||||
 | 4 | 6 May 2025 | 20 May 2025 | ||||||
 | 3 | 25 Apr 2025 | 6 May 2025 | ||||||
| 4 | 9 Oct 2025 | 6 Nov 2025 | ||||||
| 4 | 10 Jul 2025 | 20 Sep 2025 | ||||||
 | 5 | 20 May 2025 | 10 Jul 2025 | ||||||
 | 5 | 22 Apr 2025 | 10 Jul 2025 | ||||||
 | 6 | 10 Sep 2025 | 6 Nov 2025 | ||||||
| 9 | 16 Jul 2025 | 17 Nov 2025 | ||||||
 | 1 | 16 Jul 2025 | 16 Jul 2025 | ||||||
 | 1 | 20 May 2025 | 20 May 2025 | ||||||
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 |
| 17 Nov 2025 | Qing Li Peptide | View | 50mg | (no batch claim) | 29.800mg | -40.4% | 99.95% | (no batch ID) | No Label / Silver Crimp / Blue Cap | Lab E | Public | |
| 17 Nov 2025 | ZLZ Peptide | View | 50mg | (no batch claim) | 48.800mg | -2.4% | 99.95% | (no batch ID) | No Label / Copper Crimp / Clear Cap | Lab E | Public | |
| 17 Nov 2025 | HK Peptides | View | 50mg | (no batch claim) | 53.800mg | +7.6% | 99.95% | (no batch ID) | No Label / Copper Crimp / Clear Cap | Lab E | Public | |
| 7 Nov 2025 | Peptide-S | View | 50mg | (no batch claim) | 60.350mg | +20.7% | 99.97% | (no batch ID) | No Label / Silver Crimp / Blue Cap | Lab A | Public | |
| 7 Nov 2025 | Qing Li Peptide | View | 50mg | (no batch claim) | 56.990mg | +14.0% | 99.97% | Jun 2, 2025 | No Label / Silver Crimp / Blue Cap | Lab A | Public | |
| 7 Nov 2025 | Shanghai Sigma Audley SSA | View | 50mg | (no batch claim) | 55.140mg | +10.3% | 99.98% | (no batch ID) | No Label / Silver Crimp / Clear Blue Cap | Lab A | Public | |
| 7 Nov 2025 | Polaris Peptides | View | 50mg | 68.4mg | 69.350mg | +1.4% | 99.97% | POL-GC50-4 | Black Label / Silver Crimp / Clear Pink Cap | Lab A | Finnrick | |
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.