GHK-Cu
We've tested 148 samples of GHK-Cu sourced from 28 vendors between 22 Apr 2025 and 11 Dec 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 | ||||||
 | 4 | 14 Jun 2025 | 6 Dec 2025 | ||||||
 | 3 | 6 Aug 2025 | 25 Nov 2025 | ||||||
 | 4 | 20 May 2025 | 10 Jul 2025 | ||||||
| 4 | 16 Jul 2025 | 4 Aug 2025 | ||||||
 | 7 | 16 Jul 2025 | 7 Nov 2025 | ||||||
| 8 | 4 Sep 2025 | 4 Nov 2025 | ||||||
| 13 | 16 Jul 2025 | 25 Nov 2025 | ||||||
 | 19 | 10 Jul 2025 | 25 Nov 2025 | ||||||
| 6 | 4 Aug 2025 | 18 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 | Endotoxins | Batch ID | Container | Tested At | Sent By |
| 6 Dec 2025 | Biolongevity Labs | View | 50mg | (no batch claim) | 53.300mg | +6.6% | 99.83% | n/a | (no batch ID) | (no data) | Lab E | Public | |
| 25 Nov 2025 | Qing Li Peptide | View | 100mg | (no batch claim) | 97.700mg | -2.3% | 99.50% | n/a | October 12 2025 CU100 | No Label / Silver Crimp / Red Cap | Lab E | Public | |
| 25 Nov 2025 | Reta-Peptide | View | 50mg | (no batch claim) | 51.600mg | +3.2% | 99.93% | n/a | (no batch ID) | No Label / Silver Crimp / Blue Cap | Lab E | Public | |
| 25 Nov 2025 | Reta-Peptide | View | 100mg | (no batch claim) | 112.000mg | +12.0% | 99.64% | not detected | (no batch ID) | No Label / Silver Crimp / Blue Cap | Lab E | Public | |
| 25 Nov 2025 | Polaris Peptides | View | 50mg | 68.4mg | 73.100mg | +6.9% | 99.93% | not detected | POL-GC50-4 | Black Label / Silver Crimp / Clear Pink Cap | Lab E | Finnrick | |
| 18 Nov 2025 | ZLZ Peptide | View | 50mg | (no batch claim) | 78.600mg | +57.2% | 99.93% | n/a | (no batch ID) | No Label / Silver Crimp / Violet Cap | Lab E | Public | |
| 17 Nov 2025 | ZLZ Peptide | View | 50mg | (no batch claim) | 48.800mg | -2.4% | 99.95% | n/a | (no batch ID) | No Label / Copper Crimp / Clear 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.
- 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.