Cosmetic Peptide
GHK-Cu
GHK-Cu is a copper tripeptide used mainly in cosmetic skin-care formulations and studied for wound healing, skin repair, and wrinkle reduction. Human evidence is limited, and FDA has flagged compounded injectable use as a safety concern.
In depth
How it works
GHK-Cu is a naturally occurring copper-binding tripeptide. At low, nontoxic concentrations it stimulates both synthesis and controlled breakdown of collagen and glycosaminoglycans in skin, modulates matrix metalloproteinases and their inhibitors, and has documented anti-inflammatory and antioxidant activity — effects tied to its influence on a large number of genes involved in tissue remodeling.
What the research shows
GHK-Cu has one of the stronger human evidence bases among cosmetic peptides. A randomized controlled trial of a 0.1% GHK-Cu cream used twice daily for 12 weeks in women aged 40–65 reported a 31% reduction in wrinkle depth and a 15.6% increase in collagen density by ultrasound. A more recent meta-analysis of several RCTs found a consistent, moderate-to-large effect on wrinkle appearance.
Long-term data (beyond roughly a year of continuous use) is still sparse, so most of what is known applies to shorter treatment courses like those tested in trials. That evidence is specific to topical application — injectable GHK-Cu has much less human safety data behind it, and the FDA has flagged compounded injectable GHK-Cu as a category 2 safety-risk substance.
Detail
Overview
GHK-Cu is a copper tripeptide used mainly in cosmetic skin-care formulations and studied for wound healing, skin repair, and wrinkle reduction. Human evidence is limited, and FDA has flagged compounded injectable use as a safety concern.
Benefits, side effects, and protocols
Benefits list
- Wound healing
- Skin elasticity
- Wrinkle reduction
Side effects
- Local irritation
Vendor protocol
- Topical facial cream twice daily for 12 weeks
Clinical protocol
- Topical eye cream twice daily for 12 weeks
Evidence
- Low
- Cosmetic ingredient with limited human data; most support comes from skin, wound-healing, and mechanistic studies.
Regulatory
- Not Fda Approved
Research
Mechanisms
Evidence notes
- Low
- Cosmetic ingredient with limited human data; most support comes from skin, wound-healing, and mechanistic studies.
Administration
Research links
Contraindications
- None listed
Components
- None listed
Regulatory data
- Not Fda Approved
Aliases
- Copper tripeptide-1
- Copper peptide
- Tripeptide-1
- GHK copper
Used in these stacks
Related compounds
Half-life
How long does GHK-Cu stay in your system?
No human pharmacokinetic study of this compound has been published, so no half-life can honestly be stated. Here is why.
Frequently asked questions
Does GHK-Cu really improve skin?
Human randomized controlled trials support short-to-medium-term improvements in wrinkle depth and measured collagen density with topical GHK-Cu, making it one of the better-evidenced cosmetic peptides. Long-term (multi-year) safety and efficacy data is still limited.
Is GHK-Cu the same as copper peptide skincare products?
Yes — "copper peptide" in skincare almost always refers to GHK-Cu or closely related formulations. Concentration and formulation quality vary significantly between products, which affects how closely they match the concentrations used in clinical trials.
Can you inject GHK-Cu?
It is sometimes used this way in research and wellness settings, but the FDA has specifically flagged injectable and compounded GHK-Cu as a safety concern due to insufficient human data — the topical route has much more support behind it.
Educational reference only. Pepperz does not provide medical advice, diagnosis, treatment, prescribing guidance, or dosing recommendations. Sourcing GHK-Cu? Check your source before you use anything.