Copper tripeptide (GHK-Cu) is a copper-binding peptide that supports collagen and elastin synthesis, tissue remodeling, and antioxidant defense. It is used in cosmetics for anti-aging, skin firming, and wound-healing support.
| Reported effect | How often | Notes |
|---|---|---|
| Skin irritation or redness | Uncommon | Mild transient irritation, more likely at higher concentrations. |
| Contact dermatitis / allergic sensitization | Rare | May occur in individuals with copper or peptide sensitivity. |
| Stinging or itching upon application | Uncommon | Usually mild and self-limiting. |
| Incompatibility-related irritation (e.g., when layered with strong acids or vitamin C) | Uncommon | Formulation interactions may reduce tolerability or efficacy rather than cause direct toxicity. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.
Peer-reviewed papers on this ingredient, via PubMed.