Copper Peptides for Skin: A GHK-Cu Skincare Guide

What are copper peptides?

Copper peptides are complexes in which a small peptide binds a copper ion. In skincare, the term almost always refers to GHK-Cu: the tripeptide glycyl-L-histidyl-L-lysine bound to copper.

Copper Tripeptide-1 on the label

On a UK cosmetic ingredient list, GHK-Cu appears under its INCI name, Copper Tripeptide-1. If a product describes itself as a copper peptide serum but this ingredient is not listed, ask the brand to clarify which copper peptide ingredient it contains.

Topical skincare is not the same as injectable preparations

Some websites sell copper peptides in vials for injection. These are not cosmetics and are not authorised medicines. Topical cosmetic serums are designed for application to the skin only. Our products are topical cosmetics and must never be injected or taken internally.

What the evidence supports – and what it does not

Much of the research on GHK-Cu comes from laboratory, cell and animal studies, together with a limited number of small human studies of cosmetic formulations. These suggest copper peptides can be a reasonable conditioning ingredient in skincare.

The evidence does not support claims that a topical copper peptide product regenerates tissue, treats skin disease, guarantees collagen production or reverses ageing. Results from isolated ingredients cannot be assumed for a finished product.

Assessing ingredients and concentrations

Brands rarely publish concentrations, and a higher figure is not automatically better. A well-formulated product considers pH, stability, packaging and compatibility with other ingredients. Where we can verify a concentration from formulation records, we will publish it on the product page.

Patch testing and sensible precautions

• Apply a small amount to the inner forearm or behind the ear and wait 48 hours before full use.
• Introduce one new product at a time.
• Avoid applying in the same step as strong acids or high-strength vitamin C unless the product directions say otherwise.
• Stop using any product that causes persistent redness, stinging or irritation, and seek advice from a pharmacist or GP if needed.

Frequently asked questions

Sources and further reading

• UK cosmetic products: guidance (Office for Product Safety and Standards)
• Topically applied GHK as an anti-wrinkle peptide: advantages, problems and prospective (BioImpacts review)
• CosIng – EU cosmetic ingredient database (Copper Tripeptide-1)