If you've spent any time in skincare circles lately, you've probably seen the letters GHK-Cu everywhere. It's the ingredient behind our Copper Peptide Renewal Serum and GHK-Cu Dermal Infusion — but what actually is it, and why is it showing up in more routines every year?
The short version
GHK-Cu is a naturally occurring copper peptide — a small fragment of protein bound to a copper ion. It was first identified in human plasma, and researchers have been studying its role in skin since the 1970s. In skincare formulations, it's used at cosmetic concentrations to support the skin's appearance from the outside in.
Why copper, specifically
Copper is a trace mineral your body already uses in small amounts for various natural processes. In topical form, copper peptides are prized in cosmetic formulation for how they layer into a routine — lightweight, non-greasy, and compatible with most other actives.
Where it fits in a routine
We formulate GHK-Cu into two textures for two different jobs:
- Serum — our Copper Peptide Renewal Serum is lightweight and layers under moisturizer, ideal for the AM or PM step right after cleansing.
- Cream — our GHK-Cu Dermal Infusion is richer, designed to lock in hydration as a last step.
What to expect
Like most cosmetic actives, copper peptides work with consistent use over time rather than overnight. Most people build them in as a daily layer alongside sun protection, gentle cleansing, and hydration — the fundamentals that make any active ingredient work harder.
The bottom line
GHK-Cu isn't a trend for trend's sake — it's a well-studied cosmetic ingredient with real formulation history. If you're curious where to start, our Cell Renewal Cleanser is the easiest entry point into a full copper peptide routine.