Copper peptides are small peptides bound to copper, used in serums, creams, toners and scalp products. The best known is GHK-Cu, listed on ingredient labels as copper tripeptide-1. This guide explains what it is, what the research has and hasn’t shown, and why cosmetic copper peptides are a different thing from research-grade GHK-Cu.
The short answer
- What it is. GHK-Cu is a three-amino-acid peptide, glycyl-L-histidyl-L-lysine (GHK), bound to a copper ion. On cosmetic labels it appears as copper tripeptide-1, and it gives formulas a blue tint.
- Where it comes from. GHK was first isolated from human plasma in 1973. The GHK-Cu used in cosmetics is made synthetically.
- What it’s used for. In skincare, to help skin look firmer, smoother and better hydrated. Cosmetic claims are about how skin looks and feels.
- What the evidence says. Lab studies plus a small number of human studies of topical formulas, many from researchers involved in developing GHK-Cu. Interesting, not definitive.
- Not the same as research GHK-Cu. Research vials are laboratory reagents. Never put a research reagent on your skin.
What is GHK-Cu?
GHK is a tripeptide: a chain of three amino acids, glycine, histidine and lysine. It binds copper(II) ions very tightly, and that copper complex is GHK-Cu. Loren Pickart first described GHK in 1973 after isolating it from human plasma,3 and it has been studied in skin biology research since.1,2
GHK-Cu at a glance
The copper peptide behind most “copper peptide” skincare.
- Label (INCI) name
- Copper tripeptide-1
- Peptide
- Glycyl-L-histidyl-L-lysine (GHK), bound to copper(II)
- Colour
- Blue in solution; the colour comes from the copper
- Found in
- Serums, creams, toners, cleansers and scalp serums
- In skincare
- Used for the look of firmness and smoothness, alongside hydrating ingredients
- Origin
- Occurs naturally in human plasma; cosmetic GHK-Cu is synthetic
What the research has looked at
Most of what is known about GHK-Cu and skin comes from three kinds of work. It helps to keep them separate:
| Type of study | What it looked at | What to keep in mind |
|---|---|---|
| Cell and gene-expression studies | How GHK-Cu affects skin cells such as fibroblasts in culture, and which genes it is associated with | A result in a dish doesn’t show what a cosmetic does on a person’s face |
| Small human studies of topical products | Skin appearance (fine lines, firmness, texture) and skin measurements after weeks of use | Small groups, short durations, and different formulas and concentrations |
| Reviews | Summaries of the cell and human studies | Many are written by researchers involved in developing GHK-Cu |
Put simply, there is a plausible and genuinely interesting body of research, but it isn’t the standard of evidence a medicine needs.1,2 In Canada, cosmetics are sold to cleanse, condition and improve appearance. A product claiming to change the structure of skin or treat a condition is regulated as a drug.4 That is why our product claims describe how skin looks and feels, and nothing more.
What to expect
Cosmetics change how skin looks and feels. Results vary from person to person and build with consistent use over weeks, not days. Copper peptides are not a treatment for acne, rosacea, eczema, scarring or hair loss. If you have a skin or scalp condition, speak to a dermatologist or pharmacist.
Patch testing and safety
- Patch-test first. Apply a small amount to the inner forearm or behind the ear and wait 24–48 hours before using it on your face.
- Stop if it irritates. Discontinue use if you notice redness, itching or a burning feeling.
- Avoid the eyes and broken or irritated skin.
- Check the ingredients. Don’t use a product if you are sensitive to copper or to any listed ingredient.
- Keep out of reach of children.
Cosmetic copper peptides vs research-grade GHK-Cu
We sell GHK-Cu in two completely different forms, and they are not interchangeable.
| GHK-Cu skincare (cosmetic) | GHK-Cu research vial (reagent) | |
|---|---|---|
| What it is | A finished cosmetic: GHK-Cu in a formulated base | Lyophilized powder for laboratory research |
| Intended use | External use on skin and scalp | In-vitro laboratory research only |
| Formulated for skin? | Yes, with hydrating and soothing ingredients | No: a raw compound |
| Rules that apply | Canadian cosmetic regulations | Sold as a laboratory reagent; not for human or veterinary use |
| Where to find it | Peptide skincare | GHK-Cu research peptide |
Never apply a research reagent to your skin. Research vials are not made, tested or labelled for that use. If you want copper peptides for your skin, use a finished cosmetic.
You may have seen GHK-Cu named in Health Canada’s public advisory, “Think twice before injecting peptides bought online”.5 That warning is about unauthorized peptide products sold for injection, not cosmetics applied to the skin. It is one more reason never to use a research vial on yourself.
Our GHK-Cu skincare line
Five products, formulated in Canada and priced in Canadian dollars. Each is a cosmetic for external use.
| Product | Size | What it’s for |
|---|---|---|
| GHK-Cu Facial Cleanser | 100 mL | A gentle, creamy-lather cleanser with hyaluronic acid, glycerin and aloe vera that lifts away everyday impurities and makeup. |
| GHK-Cu Facial Toner | 100 mL | Rebalances skin and helps refine the look of pores. |
| GHK-Cu Facial Serum | 30 mL | A lightweight serum with hyaluronic acid, glycerin, aloe vera, cucumber and panthenol that hydrates and smooths the look of skin. |
| GHK-Cu Face Cream | 50 g | A light daily moisturizer with hyaluronic acid, panthenol and allantoin that helps improve the appearance of firmness. |
| GHK-Cu Hair Serum | 30 mL | A leave-in scalp serum with panthenol, polyglutamic acid and botanicals, for hair that looks fuller and feels stronger. |
Frequently asked questions
What are copper peptides?
Copper peptides are short peptides bound to a copper ion. The most widely used in skincare is GHK-Cu (copper tripeptide-1), a three-amino-acid peptide first isolated from human plasma and made synthetically for cosmetics.
Is GHK-Cu the same as copper tripeptide-1?
Yes. Copper tripeptide-1 is the standard (INCI) name used on cosmetic ingredient lists for GHK-Cu.
Why is copper peptide serum blue?
The copper ion gives GHK-Cu its blue colour. How deep the shade looks depends on the concentration and the rest of the formula.
Are copper peptides suitable for sensitive skin?
Many people with sensitive skin use them, but everyone’s skin is different. Patch-test first, and stop if you notice redness, itching or burning.
Do copper peptides help hair?
Copper peptides are used in scalp serums for hair that looks fuller and feels stronger. Hair loss is a medical condition; if you’re concerned about it, see a doctor or dermatologist.
Can I put research-grade GHK-Cu on my skin?
No. Research vials are laboratory reagents, not cosmetics, and are not for human use. Use a finished cosmetic instead.
Build a copper peptide routine
GHK-Cu cleanser, toner, serum, face cream and hair serum, formulated in Canada and priced in CAD. Cosmetics for external use.
Sources
- 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;19(7):1987. DOI
- Pickart L, Vasquez-Soltero JM, Margolina A. GHK peptide as a natural modulator of multiple cellular pathways in skin regeneration. Biomed Res Int. 2015;2015:648108. DOI
- Pickart L, Thaler MM. Tripeptide in human serum which prolongs survival of normal liver cells and stimulates growth in neoplastic liver. Nature New Biology. 1973;243:85–87.
- Health Canada. Guidance document: classification of products at the cosmetic-drug interface.
- Health Canada. Think twice before injecting peptides bought online: unauthorized products can seriously harm you. Public advisory, last updated 9 April 2026. Recalls and safety alerts
GHK-Cu skincare products are cosmetics for external use. They are not intended to diagnose, treat, cure or prevent any disease. Research peptides sold on this site are laboratory reagents, not for human or veterinary use.
