GHK-Cu is a copper peptide used in skincare for fine lines and skin firmness. Small studies of formulas containing it have reported improvements in wrinkles, which explains the interest. The research is still early, and the formula matters.
So what does it do, where does collagen come in, and what have researchers actually seen on skin?
What is GHK-Cu?
GHK is a chain of three amino acids: glycine, histidine, and lysine. Add copper and you get GHK-Cu. You may see it listed as copper tripeptide-1 on a skincare label, the name used in a recent skin study.
If you’re new to peptides, our simple introduction explains how those amino-acid building blocks fit together.
What does it have to do with collagen?
Collagen helps give skin its supporting structure. Cells called fibroblasts make it, along with other parts of the tissue around them.
In experiments with cultured human skin cells, GHK-Cu increased collagen and elastin production. That finding is a big part of why researchers are interested in it for skin aging.
To find out whether that translates into smoother-looking skin, researchers also need to test the finished serum or cream on people.
What do the wrinkle studies show?
In one eight-week facial study, 39 women completed a trial of a GHK-Cu serum in a lipid carrier. The serum reduced measured wrinkle depth and volume more than the control. The comparison changed both the peptide and its carrier, so the result applies to that combination.
A 2026 study followed 30 people using a cream with GHK-Cu and a fermentation extract for eight weeks. Some wrinkle measurements and hydration improved. Everyone used the same cream, with no control group to compare against. Both studies had ties to cosmetics companies.
Not every study found an improvement. In a small trial after laser resurfacing, adding GHK-Cu skincare made no significant difference to measured wrinkles or overall skin quality in the 13 people who completed it, although they reported greater satisfaction.
What about GHK-Cu injections?
The skincare studies above tested creams and serums. For injected GHK-Cu, the FDA flags potential immune-reaction risks from aggregation and peptide-related impurities, with limited human safety data.
What to look for in a copper peptide serum
Start with research on the finished product. If you’re interested in fine lines, look for wrinkle measurements. If it’s hydration, look for results that measure that. “Anti-aging” on its own tells you much less than a specific result.
It’s also worth checking how long people used the product and what it was compared with. Those details give you a clearer picture of the result than the ingredient name alone.