AHK-Cu, a tripeptide-copper complex, has preclinical evidence suggesting its potential for human hair growth by stimulating hair follicle cells and promoting cell proliferation in vitro. GHK-Cu, also a copper tripeptide, has a more extensive research base, including human trials, indicating its efficacy in accelerating skin healing, particularly after CO2 laser resurfacing and for acute skin wound healing. Reviews suggest GHK-Cu acts as a master regulator of tissue repair and regeneration, with potential roles in anti-aging and cognitive protection by reducing oxidative stress and inflammation.
| AHK-Cu | GHK-Cu | |
|---|---|---|
| Drug class | n/a | copper peptide, healing peptide |
| Studies in corpus | 2 | 94 |
| Highest evidence tier | in vitro | rct |
| Evidence tier mix | in vitro · 1 other · 1 | preclinical animal · 29 in vitro · 41 other · 9 review · 10 rct · 2 |
| Studies with explicit sample size | 0 | 0 |
| Head-to-head studies in corpus | 0 — indirect comparison only | |
Beyond the literature: here's what third-party Certificate-of-Analysis records (Janoshik, BCC, Auxlabs) say about real AHK-Cu and GHK-Cu batches we've tested. Aggregate, public data — cross-reference against the studies below.
We tested 54 AHK-Cu batches across 44 manufacturers, 99.51% avg purity.
We tested 2707 GHK-Cu batches across 1097 manufacturers, 99.73% avg purity.
We hold deeper lab coverage on GHK-Cu (2707 batches tested). GHK-Cu edges ahead on average measured purity (99.51% vs 99.73%) — a narrow gap; weigh it against failed-batch and underdose counts above.
No direct head-to-head trials in our corpus. Indirect comparison only. AHK-Cu's primary reported activity in our corpus is related to hair growth, with evidence currently limited to in vitro studies and a foundational chemical profile overview. Its mechanism appears to involve direct stimulation of hair follicle cells and upregulation of growth factors. GHK-Cu, in contrast, has been investigated more broadly, with human randomized controlled trials supporting its use in accelerating skin healing and recovery post-laser resurfacing. Reviews highlight GHK-Cu's role as a matrikine, regulating cell activity and tissue remodeling, and its potential in anti-aging and cognitive protection through mechanisms involving reduction of oxidative stress, dampening inflammation, and promotion of tissue repair. The evidence tier for GHK-Cu is higher, including human clinical trials, while AHK-Cu's reported effects are currently supported by in vitro and foundational chemical characterization studies in our corpus.
Looking for vendor-level purity, endotoxin, and HPLC data on AHK-Cu or GHK-Cu? TitrateLab tracks Certificate-of-Analysis records from the major peptide labs (Janoshik, BCC, Auxlabs) alongside the research above. Cross-reference vendor batches against the studies on this page.