GHK-Cu
Also known as Copper Peptide, Copper Tripeptide-1
A copper-binding tripeptide with real topical skin data; injectable use is less evidenced.
Medically reviewed by Dr. Jonathan Snipes, MD
Reviewed for clinical accuracy · Last reviewed July 22, 2026 · Review policy
Quick answer
GHK-Cu is a naturally occurring copper-binding tripeptide with genuine human research for topical skin use (wrinkles, firmness, wound healing), where it is a common cosmetic ingredient. Injected or systemic use for anti-aging and hair is far less evidenced, and it is not an FDA-approved drug.
- Type
- Copper-binding tripeptide
- FDA status
- Cosmetic ingredient; not an approved drug
- Route
- Topical (best evidenced); injectable (less so)
- Evidence grade
- C (Emerging Human Data, topical)
- Banned in sport
- Not specifically listed
Key takeaways
- →GHK-Cu is a natural copper peptide involved in wound healing and skin remodeling.
- →Topical GHK-Cu has real human cosmetic and dermatology data for skin appearance and firmness.
- →Injectable and systemic use for anti-aging, hair, and healing is much less evidenced.
- →It is used as a cosmetic ingredient rather than an FDA-approved drug.
GHK-Cu, a copper-binding tripeptide, is unusual in that its best evidence is topical and cosmetic rather than injectable. Applied to the skin, it has genuine human research behind claims about firmness, fine lines, and wound healing, and it is a widely used cosmetic ingredient. The injectable, systemic uses promoted in peptide circles are a different and much thinner evidence story.
How GHK-Cu works
GHK-Cu binds copper and appears to influence skin remodeling, collagen production, and wound-healing pathways. In topical formulations, these effects are supported by human skin studies. Claims about systemic anti-aging or hair growth from injected GHK-Cu extrapolate well beyond that evidence.
What the evidence shows, by use
Each use is graded on the same A-E scale, based on human-trial quality rather than popularity.
Topical skin (wrinkles, firmness, wound healing)
CEmerging Human DataSupported by human cosmetic and dermatology studies; the best-evidenced use.
Injectable anti-aging / hair growth
DPreclinical OnlyPopular but poorly supported by controlled human evidence for the injectable route.
Dosing
Topical GHK-Cu is found in over-the-counter cosmetic products at low concentrations. Injectable GHK-Cu is not an approved drug and has no validated dose. Because injectable use is both less evidenced and dependent on unregulated supply, it should involve a licensed clinician rather than self-injection of research-grade material.
Side effects
- •Skin irritation or redness (topical) · Less common
- •Injection-site reactions (injectable) · Reported
- •Contact sensitivity · Rare
Legal & regulatory status
GHK-Cu is used as a cosmetic ingredient and is legal in topical products. It is not an FDA-approved drug; injectable use falls outside any approval.
Is GHK-Culegal? Full regulatory status →Where to get it: TeleRanked independently ranks the telehealth providers that offer clinician-prescribed peptides. See our Peptide Therapy rankings. We rank providers, we do not sell compounds, and rankings are never for sale.
Frequently asked questions
Does GHK-Cu work for skin?+
Topical GHK-Cu has real human research supporting effects on skin firmness, fine lines, and wound healing, which is why it is a common cosmetic ingredient.
Is injectable GHK-Cu proven?+
No. The strong evidence is topical. Injectable and systemic uses for anti-aging or hair are much less supported by controlled human data.
How we grade evidence
Grade C: Emerging Human Data. Early or small human studies exist; results are preliminary and not yet confirmed at scale. Our A-E scale reflects the strength of human evidence, not how popular a compound is.
Sources
- 1.Compounding and the FDA: Questions and Answers · U.S. Food & Drug Administration