GHK-Cu
Also known as: Copper peptide, Copper tripeptide-1
By GLPeptideSciences Editorial Team · How we evaluate evidence · Reviewed by Dr. George S. Watson, MD, Cardiothoracic Surgeon · Updated 2026-06-02
A naturally occurring copper-binding tripeptide (Gly-His-Lys) with genuine topical cosmeceutical research and a wider base of anecdotal use for skin and hair.
What it is & how it works
What it is
GHK-Cu is a copper-binding tripeptide (glycine-histidine-lysine bound to copper) that occurs naturally in human plasma and declines with age. It’s one of the better-studied compounds in the cosmetic category.
How it is thought to work
GHK-Cu is studied for its role in wound healing, collagen and extracellular-matrix signaling, and antioxidant activity. In topical cosmetic research, these translate into measurable effects on skin appearance.
Evidence depends on the route
This is the key point for GHK-Cu: topical cosmetic use has the most credible support, while injectable/systemic community use is much less validated and introduces real sterility and copper-handling considerations. Don’t transfer confidence from the cream research to an injection.
What it's discussed & studied for
- Skin appearance and firmness (topical, better-supported)
- Wound healing
- Hair (anecdotal)
Discussion of a use is not a claim that it works or is approved.
Research status
Reasonable topical cosmetic research; injectable/systemic use in the community is far less validated.
Evidence quality
Mixed and route-dependent. Topical cosmetic data is the strongest part of its profile; systemic claims are weaker and more anecdotal.
Dosing discussion
Most credible use is topical (serums/creams). Injectable community protocols exist but are far less supported; route dramatically changes the risk/evidence picture.
Educational summary of what is discussed in the literature and community — not a dosing recommendation or medical advice.
Safety & harm reduction
Topical use is generally well tolerated. Injectable use raises sterility and copper-handling questions and is not clinically validated. Not an FDA-approved drug.
Sourcing literacy
For topical products, formulation and concentration matter. For injectables, sterility and accurate copper-peptide content are critical — verify with testing.
Selected literature
FAQ
Is GHK-Cu evidence the same for creams and injections?
No. The better-supported use is topical/cosmetic. Injectable use is far less validated and adds sterility and copper-handling risks.
Is it a natural molecule?
Yes — GHK is a tripeptide that occurs naturally in the body; GHK-Cu is its copper-bound form.