Reviewed by the Peptica editorial team
Published 5 June 2026
Source-based, neutral information — no medical advice, no sales. Editorial standards
GHK-Cu is a naturally occurring copper peptide whose levels decline with age. Research has studied it mainly in the context of collagen, skin structure and wound healing, which is why it appears as an ingredient in many cosmetic serums. This article explains neutrally what GHK-Cu is, what the evidence shows, and where the line runs between cosmetic use and unapproved systemic use.
What is GHK-Cu?
GHK-Cu is a short three-amino-acid peptide that binds a copper ion. It occurs naturally in the human body, for example in blood plasma. Levels decline with age, a point that makes it of particular interest to research in the longevity and skin context.
Skin & anti-aging
GHK-Cu's best-known research area is the skin. Studies have examined whether it supports processes around collagen, skin firmness and repair. This is precisely why it is used as an active ingredient in high-end anti-aging serums.
- Collagen and skin structure (research context)
- Wound healing and tissue repair (mostly older studies)
- Antioxidant properties (preclinical)
Hair
GHK-Cu is also discussed in the context of hair-follicle research. The evidence here is much thinner than for skin and largely preliminary.
Cosmetic vs. systemic – the key difference
As a topical ingredient, GHK-Cu is widely used in cosmetic products and regulated within that framework. This is distinct from systemic use as an injectable peptide: for that, GHK-Cu is not approved as a medicine, and human data is limited.
Frequently asked questions
Does GHK-Cu work in skincare?+
There is research on collagen and skin structure, but the strength of evidence varies by study and formulation. GHK-Cu is an established cosmetic ingredient; individual efficacy claims should be viewed critically.
Is GHK-Cu safe?+
At cosmetic concentrations it is generally considered well tolerated. For systemic (injectable) use, sufficient human data is lacking, and such use is not approved.
What does the Cu in GHK-Cu mean?+
Cu is the chemical symbol for copper. GHK-Cu is the peptide GHK bound to a copper ion.
Related peptides
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