Copper Peptide (GHK-Cu)
A naturally occurring copper-binding tripeptide (glycyl-histidyl-lysine bound to copper) that occurs in human plasma and is widely used in topical formulas, studied for its role in the appearance of skin firmness and texture. It was first isolated from human plasma in the 1970s and has since become one of the more established peptide actives in the anti-aging category. Because copper itself is the active handle, the same property that makes it a useful signal peptide also makes it a stability concern around other reactive actives.
Studied for
- ·The appearance of firmness and elasticity
- ·The look of skin smoothness and texture
- ·Supporting the skin’s visible renewal
- ·The appearance of a more resilient-looking complexion after visible stress
How it’s thought to work
Studied as a signal peptide that delivers copper and is associated with matrix-remodeling activity in skin-model research, including support for collagen, elastin and glycosaminoglycan production in cell culture. Some of this work traces back to wound-healing research, where copper peptides were investigated for tissue-repair and antioxidant-enzyme activity before crossing over into cosmetic use. Peptide fragments that lack the bound copper do not show the same signaling behavior in lab models, which is why copper delivery is considered central to the mechanism.
After CO2 laser resurfacing, people using a copper peptide regimen felt skin quality looked improved, though measured wrinkle scores did not differ.
Effects of topical copper tripeptide complex on CO2 laser-resurfaced skin. Archives of Facial Plastic Surgery, 2006.
View on PubMed (PMID 16847171) ↗Layering note
Often kept apart from: direct L-ascorbic acid (vitamin C).
Questions
- Can I use copper peptides with vitamin C?
- They are commonly separated to different routines (for example one in the morning, one in the evening). Layered directly, strong L-ascorbic acid can affect the copper complex, so most guides suggest not applying them at the same time.
- How often can copper peptide serums be used?
- Most formulas are built as a standard once- or twice-daily treatment serum. There is no established need to cycle them off, though many routines simply place copper peptides at night and vitamin C in the morning to keep the two apart.
- Does the blue-green color mean the serum is working?
- The color comes from the copper itself and is a reasonable sign it is present, but color alone does not confirm the concentration or how well the formula has been stabilized. Packaging and how quickly the product is used still matter more than the tint.