What is GHK-Cu?
GHK-Cu is a copper peptide — the tripeptide glycyl-L-histidyl-L-lysine bound to a copper ion. It occurs naturally in human plasma, saliva, and urine, and its levels decline with age, which is part of why it became interesting for skin and repair research.1
It’s one of the most-studied peptides in cosmetic science, with decades of topical research behind it. The honest nuance: the strongest evidence is for topical skin use — data for injectable and systemic use is much thinner.2
Benefits & what it’s studied for
Topical studies suggest GHK-Cu can stimulate collagen and elastin and improve firmness, fine lines, and texture.2
GHK-Cu has a long research history in wound healing and tissue remodeling, supporting the skin’s repair machinery.1
GHK-Cu appears in some hair formulas for follicle support, but the hair evidence is more limited than the skin evidence.3
How does GHK-Cu work?
GHK-Cu’s job is largely to deliver copper — an essential cofactor for many repair enzymes — to where the skin needs it, while also acting as a signal that switches on tissue-remodeling and antioxidant genes.1 The result, in studies, is a shift toward a more “youthful,” repair-oriented state in skin cells.
Dosing & administration
For injectable or higher-dose systemic use, long-term human safety data is more limited — which is exactly why that route belongs with a provider.
This is educational, not medical advice. We don’t publish dosing. Topical use follows product labels; injectable/compounded use is decided by a licensed provider. Not evaluated by the FDA as a drug.
Legality & status
GHK-Cu is widely sold as a cosmetic ingredient in topical skincare, but it is not an FDA-approved drug. Injectable or compounded GHK-Cu is a different matter — that route is through a licensed provider and compounding pharmacy where permitted. See how legitimate peptide therapy works.
Thinking about GHK-Cu?
Talk to a licensed provider who can tell you if it fits your goals — and build a safe protocol.
Research & references
- 1Pickart L, Margolina A. GHK-Cu peptide in skin regeneration and tissue repair. Int J Mol Sci. link pending
- 2Topical copper-peptide studies on collagen, firmness, and photoaging. Citation to be finalized. link pending
- 3GHK-Cu and hair-follicle support — limited-evidence review. Citation to be finalized. link pending
Reference links are illustrative placeholders — replace with verified PubMed/journal URLs before publishing.
Frequently asked questions
What does GHK-Cu do for skin?+
GHK-Cu is a copper peptide studied for stimulating collagen, improving skin firmness and texture, and supporting wound healing. It’s one of the better-studied cosmetic peptides, though most of the human work is in topical skincare rather than injectable use.
Does GHK-Cu regrow hair?+
GHK-Cu has been studied for follicle support and appears in some hair formulations, but the evidence for hair regrowth is more limited than for skin. A provider can set realistic expectations.
Is GHK-Cu better topical or injected?+
Topical GHK-Cu is common in skincare and has the most consumer track record; injectable use is also discussed for systemic goals. The right route is a clinical decision and depends on your goal.
Is GHK-Cu safe?+
For injectable or higher-dose use, long-term human safety data is more limited, so provider supervision matters.
Is GHK-Cu FDA-approved?+
GHK-Cu appears as an ingredient in cosmetic products, but it isn’t an FDA-approved drug. Injectable or compounded use is through a licensed provider and pharmacy where permitted.