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Cosmetic and topical
Skin & aging
Copper tripeptide-1
Also called GHK-Cu
GHK-Cu is a copper-bound tripeptide used in skincare. See how it works in lab studies and why human evidence for cosmetic benefit is still limited.
- Reviewed by
- William Maish, MD MBA MPH, Clinical Product Lead
- Published
- October 5, 2026
- Last updated
- October 5, 2026
Key takeaway
Copper tripeptide-1, often called GHK-Cu, is a three-amino acid peptide (glycine-histidine-lysine) bound to a copper ion and used in skincare for its proposed role in skin renewal. Laboratory and animal studies show it can signal cells to make collagen and other matrix components. Independent human evidence is thin. In a randomized trial of 13 patients after CO2 laser resurfacing, GHK-Cu skincare showed no significant difference in redness or skin quality in blinded evaluations, though patients rated their overall skin quality higher (p = 0.04). As of 2026 it is a cosmetic ingredient, not an FDA-approved drug.
What is copper tripeptide-1?
Copper tripeptide-1 is a peptide made of three amino acids, glycine, histidine, and lysine, joined to a copper ion. The peptide part, known as GHK, occurs naturally in the body and declines with age. In its copper-bound form, GHK-Cu, it is one of the longest-studied "copper peptides" in skincare and is used in products marketed for skin renewal and repair. It is a cosmetic ingredient, not a drug.
How does it work?
Laboratory studies suggest copper tripeptide-1 acts as a signal that tells skin cells to rebuild the supporting matrix. In cell and animal studies1, GHK-Cu:
- Stimulates fibroblasts to produce collagen, elastin, and glycosaminoglycans, the molecules that give skin its structure and cushioning
- Helps regulate the enzymes that break that matrix down
- Delivers copper, a mineral involved in tissue repair
- Has been shown to act as an antioxidant and to support wound healing in animal models
Reviews of laboratory work describe further activity, mostly studied in cells and animals rather than in skin products. In gene-expression analyses2, the GHK peptide shows anti-inflammatory activity, increased blood-vessel formation, and changes in many genes tied to repair. These are systemic, preclinical findings, separate from the topical cosmetic use this page covers.
Because of this activity, it is used in cosmetics with the aim of improving the appearance of firm, smooth, and evenly textured skin. These are laboratory and animal findings describing how the peptide behaves; in finished products the benefit is described in appearance terms rather than as a medical repair claim.
Is it FDA-approved?
No, and it does not need to be. The FDA does not pre-approve cosmetic ingredients. Cosmetics may describe effects on the look and feel of skin, while claims to change the body's structure or function would place a product in the drug category. Copper tripeptide-1 is used as a cosmetic ingredient, for the appearance of the skin.
What is it used for?
Copper tripeptide-1 is used in "anti-aging" serums, creams, and post-procedure products, and also in some hair and scalp products. The appearance goals are the look of firmer, denser skin, a reduction in the appearance of fine lines, and smoother texture, as well as a soothed look after cosmetic procedures.
What does the research show?
The research is deep on mechanism but thinner on independent human appearance outcomes. According to PubMed, review articles3 summarize extensive laboratory and animal evidence that GHK-Cu promotes matrix synthesis and wound healing, though many of those studies are associated with the ingredient's commercial developers.
An independent randomized trial of 13 patients4 used GHK-Cu skincare after CO2 laser resurfacing. Blinded evaluators found no statistically significant difference in redness or skin quality, although patients rated their overall skin quality higher (p = 0.04). In short, the mechanism is well characterized, but strong independent proof of a cosmetic appearance benefit is still limited.
Separately, a small set of animal studies tested GHK-Cu given by injection, and these findings are systemic and preclinical:
| Model | Finding |
| Rats after knee ligament reconstruction | Weekly joint injections for 4 weeks5 led to a smaller knee laxity difference than saline at 6 weeks (p = 0.009), but the difference was not significant at 12 weeks |
| Mice with lipopolysaccharide-induced acute lung injury | GHK-Cu lowered TNF-alpha and IL-6 through NF-κB p65 and p38 MAPK suppression6 |
Because both studies are in animals, they do not show an effect of systemic use in people.
What are the side effects?
Copper tripeptide-1 is generally well tolerated on the skin. Potential concerns are mostly practical: very high copper concentrations could be irritating, and the ingredient can be destabilized when layered with strong acids such as high-strength vitamin C or certain exfoliants, which is a formulation consideration rather than a safety hazard. Sensitive skin may react to any new product, so a patch test is reasonable.
Sources: review articles on GHK-Cu biology (Pickart and Margolina, BioMed Research International, 2015, DOI: 10.1155/2015/6481081; Pickart, Journal of Biomaterials Science, 2008, DOI: 10.1163/1568562087849094353); and an independent randomized post-laser trial (Miller et al., Archives of Facial Plastic Surgery, 2006, DOI: 10.1001/archfaci.8.4.2524), all indexed on PubMed. This document is educational and does not constitute medical advice.