Three selected human reports cover topical wound and post-laser skin care, plus a multi-ingredient intradermal hair formulation containing copper tripeptide-1. Formulation and route are kept separate. This is not an exhaustive review of GHK or GHK-Cu.123
Bottom line from this bounded source set
The selected topical studies had different findings: the ulcer study reported improved closure, while the small post-laser study found no objective advantage in erythema or skin appearance. The uncontrolled hair study cannot attribute changes to GHK-Cu alone or establish the safety of other injected formulations.123
A multicenter randomized, evaluator-blinded study compared a topical copper-peptide gel with vehicle alongside standardized wound care.1
Population
The report concerns patients with diabetic neuropathic ulcers; the PubMed abstract does not state the total sample size.1
Outcomes reported
The authors reported greater plantar-ulcer area closure and fewer infections in a selected immediate-treatment comparison. These are results for the studied topical formulation and wound-care setting.1
Limitations
Subgroup and treatment-timing comparisons require full-text assessment. The abstract alone does not establish overall healing benefit, general safety, or effectiveness by other routes.1
Reviewed study record
Post-laser skin care: small randomized comparison
Design
Patients receiving carbon-dioxide laser resurfacing were randomized to skin-care regimens with or without GHK-Cu.2
Population
Thirteen patients completed the study; outcomes were assessed through 12 weeks.2
Outcomes reported
Blinded and computer assessments found no significant between-group improvement in erythema resolution, wrinkles, or overall skin quality. Patient-reported skin-quality improvement favored the GHK-Cu regimen.2
Limitations
The sample was small, and subjective and objective findings differed. These findings do not establish a general anti-aging effect or apply to injectable use.2
Reviewed study record
Hair research: multi-ingredient formulation
Design
An open-label, single-arm pilot evaluated an intradermal formulation containing several growth factors and copper tripeptide-1.3
Population
The authors reported treating 1,000 patients with hair loss.3
Outcomes reported
The report described improvements in hair assessments and patient impressions and reported that treatment was well tolerated.3
Limitations
There was no control group and the formulation contained multiple active ingredients. The study cannot isolate a GHK-Cu effect or establish safety for GHK-Cu injections alone.3
No registered Crossref update in the reviewed snapshotChecked September 15, 2026 for DOI 10.1046/j.1524-475x.1994.20406.x. This bounded result is not proof that the publication has never been corrected or retracted. Open the pinned Crossref work endpoint ↗
No registered Crossref update in the reviewed snapshotChecked September 15, 2026 for DOI 10.1001/archfaci.8.4.252. This bounded result is not proof that the publication has never been corrected or retracted. Open the pinned Crossref work endpoint ↗
No registered Crossref update in the reviewed snapshotChecked September 15, 2026 for DOI 10.1080/14764172.2018.1439965. This bounded result is not proof that the publication has never been corrected or retracted. Open the pinned Crossref work endpoint ↗