What it is
GHK-Cu is a complex of the tripeptide glycyl-L-histidyl-L-lysine (GHK) with copper. It occurs naturally in human plasma and other tissues, and its concentration is reported to decline with age. It is best known as an ingredient in topical skincare, where it has been studied for skin appearance and repair.
What researchers are studying
- Copper delivery and modulation of enzymes involved in skin remodeling.
- Stimulation of collagen and extracellular-matrix components in skin models.
- Investigated antioxidant and wound-healing signaling effects.
Areas studied
- Skin appearance, collagen and cosmetic use (some human topical data)
- Wound healing (preclinical and topical)
- Hair and tissue-repair signaling (preclinical)
Evidence summary
Human research
GHK-Cu has been evaluated in some human studies in topical/cosmetic settings, where research has examined skin appearance and barrier-related endpoints. Evidence for systemic or injectable use in humans is much weaker and largely absent from controlled trials.
Preclinical & animal research
Laboratory and animal research has explored GHK-Cu's effects on collagen synthesis, wound healing, and gene-expression patterns related to tissue repair. These findings are exploratory and, outside of topical cosmetic contexts, have not been confirmed in large human trials.
Limitations & uncertainties
- Strongest human data is limited to topical/cosmetic use.
- Systemic/injectable use is largely unstudied in humans.
- Formulation and copper content vary between products.
Safety & research considerations
GHK-Cu is used in cosmetic products, but non-topical use is not an approved medical treatment and lacks controlled human safety data. Copper exposure should be considered carefully. This page does not provide dosing guidance.
Frequently asked questions
- Is GHK-Cu used in skincare?
- Yes. GHK-Cu (copper tripeptide-1) is a common cosmetic ingredient studied for skin appearance and repair in topical formulations.
- Is injectable GHK-Cu supported by human research?
- Human evidence for systemic or injectable GHK-Cu is very limited; most non-topical findings come from preclinical studies.
References & further reading
Curated literature searches on PubMed and clinical-trial registries. A formal, per-study citation list is being expanded during ongoing editorial review.