Short answer
Peptides appear in skincare under names like copper tripeptide-1, palmitoyl pentapeptide-4 and collagen peptides. The most studied is GHK-Cu, a copper-binding tripeptide with decades of research in skin cell models. A good label names the exact peptide; a good claim points to research on that exact peptide.
The peptide families you will see
Skincare labels usually contain one of these types:
Why GHK-Cu is the most studied
GHK-Cu (glycyl-histidyl-lysine copper) was isolated from human plasma in the 1970s. Since then it has appeared in a large body of skin and tissue research, including studies on collagen-related pathways, extracellular matrix remodeling and oxidative stress in cell models [1].
A 2024 review of bioactive factors in skin research lists copper peptides and collagen peptides among the compounds studied for collagen synthesis and skin barrier function in experimental models [2].
How to read a peptide label
Consumer skincare vs research peptides
There is an important difference:
If you are a researcher, GHK-Cu research material and skincare formulations are different tools for different questions. See our GHK-Cu research guide for the laboratory side.
FAQ
What are the main peptide types in skincare?
Copper peptides, collagen peptides, signal peptides and carrier peptides.
What is a copper peptide?
A short peptide bound to a copper ion; GHK-Cu is the best-studied example.
Are skincare peptides the same as research peptides?
No - consumer cosmetics and RUO research materials are different categories.
How can I evaluate a claim?
Check the exact peptide name, concentration and peer-reviewed studies on that peptide.