GHK-Cu copper peptide: skin research, evidence quality and how it is used
GHK-Cu is a naturally occurring copper-binding tripeptide used in skincare. What the research shows for skin, where the evidence is thin, and how topical and injectable use differ.
What GHK-Cu is
GHK is a tripeptide made of glycine, histidine and lysine. It binds copper ions strongly, and the copper complex is called GHK-Cu. In cosmetic ingredient lists it appears as copper tripeptide-1.
GHK was isolated from human plasma in 1973 by Loren Pickart. It occurs naturally in plasma, saliva and urine.
Why it attracted interest
Reviews by Pickart and colleagues report plasma GHK levels of about 200 ng/mL at age 20, falling to about 80 ng/mL by age 60. The decline coincides with reduced regenerative capacity, which led to the hypothesis that GHK supports tissue repair.
Laboratory studies have reported effects on collagen and glycosaminoglycan synthesis, wound healing in animal models and broad changes in gene expression. Correlation with age and laboratory activity do not by themselves prove a benefit when applied to people.
Evidence in human skin
The human evidence is mainly from topical cosmetic studies. Reviews cite small controlled studies, including a 12-week study in women with photoaged skin, reporting improvements in skin density, thickness and fine lines with GHK-Cu creams.
Most of these studies are small, short and often linked to ingredient developers. They support GHK-Cu as a reasonable cosmetic ingredient but do not reach the standard required for medical treatment claims.
Topical versus injectable
Topical use in cosmetics is the established, regulated use. Injectable GHK-Cu is a different matter: it is not an approved medicine, and in the US the FDA has treated injectable routes separately from other routes in its compounding categories during 2026.
Copper is biologically active and has its own toxicity profile. Evidence from creams does not establish the safety of injecting the same substance.
Choosing and reading products
For cosmetics, the ingredient list will show copper tripeptide-1; concentration is often undisclosed. GHK-Cu is typically blue because of the copper complex. Formulation matters: some ingredients, such as strong acids or certain antioxidants, may interact with copper complexes.
For research material, check identity confirmation, copper content and purity documentation for the specific batch.
Frequently asked questions
What does GHK-Cu do for skin?
Small topical studies report improvements in skin density, thickness and fine lines. The evidence is promising for cosmetic use but limited in size and independence.
Is GHK-Cu natural?
GHK occurs naturally in human plasma, saliva and urine. Commercial GHK-Cu is synthesised.
Are GHK-Cu injections approved?
No. Injectable GHK-Cu is not an approved medicine. Established use is topical, in cosmetics.
Sources
- Pickart L et al. GHK Peptide as a Natural Modulator of Multiple Cellular Pathways in Skin Regeneration (PMC)
- Pickart L, Margolina A. Regenerative and Protective Actions of the GHK-Cu Peptide in the Light of the New Gene Data. Int J Mol Sci 2018
- FDA: Bulk drug substances nominated for use in compounding — category updates
Editorial and source policy
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