GHK-Cu
One of the most studied peptides for skin and hair. Naturally occurs in your body but declines with age. Shown to boost collagen, improve skin elasticity, and may support hair thickness.
This peptide is not FDA-approved for any indication. Human use outside of clinical trials is not recommended.
The basics
- Generic Name
- GHK-Cu (copper peptide)
- Brand Names
- None (not an approved product)
- Regulatory Status
- Early Research
- Therapeutic Areas
- Musculoskeletal, Immune & Recovery
Wellness Goals
Important: This peptide is not yet FDA-approved
GHK-Cu has not been approved by the FDA for any use in humans. That means it hasn't gone through the rigorous testing process that confirms a drug is safe and effective. Products sold online have not been evaluated by any regulatory body.
What it does
GHK-Cu (GHK-Cu (copper peptide)) is a synthetic peptide that researchers are studying, but it's not yet FDA-approved for any human use. A naturally occurring tripeptide-copper complex that declines with age. Stimulates collagen synthesis, promotes wound healing, acts as an antioxidant, and may support hair follicle growth.
The research is still early. Most studies so far are in animals or lab settings, so we don't know for sure how well this translates to real-world results in people.
How it's taken
Topical cream or serum (most common)
Subcutaneous injection
How people access it
Topical GHK-Cu is widely available in over-the-counter skincare products — no prescription needed. Injectable GHK-Cu has been Category 1 compounding-eligible since February 2026 and requires a prescription from a doctor sent to a compounding pharmacy.
Regulatory Status
Not FDA-approved as an injectable drug. Well-studied as a topical skincare ingredient. Injectable use is not regulated.
Any use in humans outside of an FDA-authorized clinical trial would require an Investigational New Drug (IND) application. Products marketed as “for research use only” are not legally intended for human administration.
What the Evidence Shows
The evidence base for GHK-Cu consists primarily of preclinical studies (animal models and in vitro experiments). There are no completed, large-scale, peer-reviewed clinical trials establishing safety or efficacy in humans. The gap between promising animal data and proven human benefit is substantial — many compounds that show effects in animal studies fail to demonstrate safety or efficacy in human trials.
Marketing claims made by online sellers and “peptide clinics” frequently overstate the evidence and omit critical information about risks and unknowns.
Other options to consider
Depending on what you're hoping to achieve, there may be FDA-approved treatments that have been rigorously tested and proven to work. Discuss evidence-based options with your own healthcare provider to find what fits your specific goals.
Browse our full peptide directory to see FDA-approved options that might work for you.
Common Questions
Yes — GHK-Cu is available in many topical skincare products and has good evidence for skin benefits when applied topically. Injectable forms are a different story and not FDA-regulated.
Topically, it has a good safety profile backed by cosmetic research. Injectable GHK-Cu is not FDA-approved and carries the risks of any unregulated injectable.
Some studies suggest GHK-Cu may support hair follicle health. The evidence is promising but not conclusive. Consult your dermatologist about your specific situation.
Curious about what IS approved?
Check out FDA-approved peptides that address similar goals — with established safety profiles and real clinical evidence.
See Approved Options