Why GHK-Cu attracts interest
GHK is the tripeptide glycyl-histidyl-lysine. It binds copper(II) to form GHK-Cu. An early laboratory study reported an increase in collagen synthesis in fibroblast cultures, providing an experimental basis for investigating its relationship with connective-tissue biology. [1]
For skin research, the useful question is specific: how does GHK-Cu affect the formation and organization of the extracellular matrix under defined conditions? Collagen-related measurements can help explore that question, while visible changes in skin require a different kind of study.
What the selected studies measured
This is a focused reading list of three primary studies, rather than a systematic review of all GHK-Cu literature.
Maquart et al.
Increased collagen synthesis was reported without an increase in cell number.
Interpretation: A cell-culture endpoint does not measure visible skin changes in people.
Maquart et al.
The investigators observed greater accumulation of collagen and other matrix components in wound chambers.
Interpretation: The model is an experimentally created wound, rather than a study of cosmetic outcomes in humans.
Chen et al.
A GHK-Cu-loaded composite hydrogel was investigated for wound repair, including epithelialization and vascular regeneration.
Interpretation: The tested material includes a delivery matrix. Its results cannot be assigned to every GHK-Cu preparation.
A recent direction: delivery materials
In 2025, Chen and colleagues investigated a GHK-Cu-loaded hydrogel made using egg-white components and oxidized konjac glucomannan. Their work included infected-wound experiments in mice and reported effects on wound repair, including epithelialization and vascular regeneration. [3]
The distinction matters: the study evaluates a composite dressing. Its structure, release behavior and other ingredients are part of the experiment. This is an example of current research into how a compound can be incorporated into a material, rather than evidence that every GHK-Cu format will behave alike.
From a research signal to a useful conclusion
The 1988 culture study and 1993 rat study give researchers reasons to investigate collagen and matrix formation. They answer questions about those experimental systems. Neither study directly measures improvements in wrinkles, skin appearance or collagen production following use of an Avitus product. [1] [2]
When evaluating a paper, identify the exact material, model, comparison group and measured outcome. A concentration used in a laboratory experiment is not a human-use instruction. Likewise, ingredient identity, analytical purity and an observed biological effect are separate questions.
The research interest is therefore best described as investigation of GHK-Cu in collagen synthesis, matrix biology and experimental skin-repair systems. A general promise of improved skin would go beyond the findings summarized here.
Primary sources
- Maquart et al. (1988). Stimulation of collagen synthesis in fibroblast cultures by the tripeptide-copper complex glycyl-L-histidyl-L-lysine-Cu2+.DOI: 10.1016/0014-5793(88)80509-X
- Maquart et al. (1993). In vivo stimulation of connective tissue accumulation by the tripeptide-copper complex glycyl-L-histidyl-L-lysine-Cu2+ in rat experimental wounds.DOI: 10.1172/JCI116842
- Chen et al. (2025). Food-Derived Tripeptide–Copper Self-Healing Hydrogel for Infected Wound Healing.DOI: 10.34133/bmr.0139
Source scope: the indexed publication records and abstracts informed this note. The 2025 study was checked through its indexed PubMed/PMC record; full-text access was unavailable during preparation. This selection does not assess all clinical or cosmetic studies.