Copper Tripeptide-1 (GHK-Cu) vs GHK-Cu (Copper Peptide)
Multi-functional copper peptide complex that stimulates collagen, enhances wound healing, and provides broad antioxidant protection for skin renewal.
A naturally occurring copper peptide that acts like a master switch for your body's repair systems—boosting collagen production, accelerating wound healing, and helping your skin rebuild itself from the inside out [1][4].
Written by Michael Carroll — Owner, Director of Research · Reviewed by the Peptide Initiative Research Team · Editorial standards
Quick comparison
Dose range
Copper Tripeptide-1 (GHK-Cu)
0.01%–1% %
GHK-Cu (Copper Peptide)
0.1–0.1 %
Frequency
Copper Tripeptide-1 (GHK-Cu)
Once daily
GHK-Cu (Copper Peptide)
Once or twice daily, topical
Administration
Copper Tripeptide-1 (GHK-Cu)
Topical
GHK-Cu (Copper Peptide)
Subcutaneous injection
Cycle length
Copper Tripeptide-1 (GHK-Cu)
Ongoing/indefinite
GHK-Cu (Copper Peptide)
12 weeks, then ongoing
Onset speed
Copper Tripeptide-1 (GHK-Cu)
Moderate (1-2 weeks)
GHK-Cu (Copper Peptide)
Moderate (1-2 weeks)
Evidence level
Copper Tripeptide-1 (GHK-Cu)
Limited human trials
GHK-Cu (Copper Peptide)
Strong preclinical (extensive animal studies)
Benefit ratings
Wound Healing
Antioxidant Defense
Skin Rejuvenation
Tissue Regeneration
Compound specifications
Copper Tripeptide-1 (GHK-Cu)
Molecular formula
C14H22N6O4Cu
Molecular weight
401.9 Da
Half-life
Susceptible to enzymatic degradation; liposomal formulation extends stability. Highly water-soluble (325 mg/mL).
Bioavailability
Limited percutaneous absorption at topical concentrations (local dermal effects primary); systemic bioavailability via injection
CAS number
49557-75-7
GHK-Cu (Copper Peptide)
Molecular formula
C14H23N6O4Cu
Molecular weight
403.93 g/mol
Half-life
Approximately 1 hour (plasma)
Bioavailability
High when injected subcutaneously; variable topically depending on formulation
CAS number
49557-75-7
Dosing compared
Copper Tripeptide-1 (GHK-Cu)
GHK-Cu (Copper Peptide)
Topical
0.1% cream (roughly 1 mg/mL)
Once or twice daily to the treatment area · 12 weeks for visible results, then ongoing
This is the only GHK-Cu route with a controlled human trial behind it, and the trial was largely negative. Thirteen patients used a GHK-Cu aftercare regimen after CO2 laser resurfacing; blinded assessment found no significant improvement in redness, wrinkles or overall skin quality versus the control regimen, and only the patients' own rating separated (P = 0.04) [7]. Topical wound-healing evidence beyond that is animal — 24 rats with ischemic wounds, where the copper tripeptide gel reduced wound area faster than vehicle [4]. Concentration matters and is not standardised across products; the figures quoted for cosmetic creams come from industry reports rather than independent trials [1][2].
Subcutaneous
No established human dose
Not established · Not established
There are no human studies of injected GHK-Cu by any systemic route. The GHK-Cu studies registered on ClinicalTrials.gov are topical or transdermal [13]. The 1-2 mg figures circulated for subcutaneous use trace to community practice, not to any published study, and no human toxicology exists for the copper load a systemic dose would deliver. The Pickart literature most often cited for GHK-Cu is mechanistic and wound-repair work, not injectable dosing [1][2][3].
Best suited for
Copper Tripeptide-1 (GHK-Cu)
Individuals seeking comprehensive skin rejuvenation with antioxidant protection
Copper Tripeptide-1 (GHK-Cu) is particularly well-suited for individuals focused on individuals seeking comprehensive skin rejuvenation with antioxidant protection. Research and clinical experience suggest meaningful benefits in this area when used as part of a comprehensive treatment approach.
Those with wounds, scars, or post-procedural skin requiring accelerated healing
Copper Tripeptide-1 (GHK-Cu) is particularly well-suited for individuals focused on those with wounds, scars, or post-procedural skin requiring accelerated healing. Research and clinical experience suggest meaningful benefits in this area when used as part of a comprehensive treatment approach.
People experiencing hair thinning who want to support follicle health
Copper Tripeptide-1 (GHK-Cu) is particularly well-suited for individuals focused on people experiencing hair thinning who want to support follicle health. Research and clinical experience suggest meaningful benefits in this area when used as part of a comprehensive treatment approach.
Individuals looking for multi-pathway anti-aging through a single active ingredient
Copper Tripeptide-1 (GHK-Cu) is particularly well-suited for individuals focused on individuals looking for multi-pathway anti-aging through a single active ingredient. Research and clinical experience suggest meaningful benefits in this area when used as part of a comprehensive treatment approach.
GHK-Cu (Copper Peptide)
Anti-Aging Warriors
If fine lines, sagging skin, and lost elasticity are your enemies, GHK-Cu is your secret weapon. It ramps up collagen and elastin production—the two proteins responsible for keeping your skin firm and youthful [1][2]. Studies show it can tighten loose skin and improve elasticity better than many popular skincare ingredients [1][2].
Wound Healing Champions
Whether you're recovering from surgery, dealing with stubborn wounds, or healing from a cosmetic procedure, GHK-Cu accelerates the entire repair process [4]. It attracts immune cells, builds new blood vessels, and stimulates the growth factors your body needs to rebuild tissue faster and better [1].
Scar Reducers
GHK-Cu doesn't just heal wounds—it helps remodel scar tissue. By regulating how your body lays down collagen during healing, it can help scars become flatter, softer, and more like surrounding normal skin [6]. It even reduces the TGF-beta signals that lead to thick, raised scars [12].
Hair Growth Seekers
Research shows GHK-Cu can enlarge hair follicles and activate the Wnt/beta-catenin pathway—the signaling system that tells hair follicles to grow [1]. If you're noticing thinning hair or increased shedding, this peptide may help stimulate thicker, healthier growth over time.
Side effects
Copper Tripeptide-1 (GHK-Cu)
Common
- Mild Tingling or Warmth
- Transient Redness
- Skin Dryness or Peeling
Uncommon
- Injection Site Reactions
- Allergic Contact Dermatitis
Serious
- Copper Accumulation (Theoretical with Injection)
- Copper Toxicity from Excessive Accumulation
GHK-Cu (Copper Peptide)
Common
- Injection site redness
- Skin tingling (topical use)
- Minor bruising
- Mild swelling at injection site
Uncommon
- Mild headache
- Temporary skin purging (topical)
Serious
- Allergic reaction
Safety & evidence
Copper Tripeptide-1 (GHK-Cu)
Evidence level
Limited human trials
FDA status
Research compound
Safety overview
Copper Tripeptide-1 (GHK-Cu) is not FDA-approved and lacks human clinical safety data, though cosmetic use in topical formulations is generally recognized as safe based on its composition. The tripeptide-copper complex has been shown to be non-toxic in in vitro cell studies and animal models at cosmetic concentrations (< 200 ppm). However, systemic absorption and safety at higher concentrations or with chronic use remain untested in humans. Copper accumulation in tissues is theoretically possible with repeated systemic use, and effects on copper metabolism have never been characterized. No human Phase 1 studies or formal toxicology assessments have been conducted.
Contraindications
- Wilson's disease (genetic copper metabolism disorder)
- Known hypersensitivity to copper compounds or GHK-Cu
- Active skin infections at the application site
- Severe hepatic impairment (reduced copper clearance capacity)
GHK-Cu (Copper Peptide)
Evidence level
Strong preclinical (extensive animal studies)
FDA status
Research compound
Safety overview
GHK is a peptide the body makes on its own — it turns up in human blood serum and cerebrospinal fluid, where it binds copper [5]. The peptide's original describer reports that the amount circulating falls with age, from roughly 200 ng/mL around age 20 to about 80 ng/mL by age 60 [2]. That is a description of what declines, not evidence that replacing it does anything. Almost all of the safety evidence is topical or laboratory work. The one randomized human trial of topical GHK-Cu — 13 patients using it after CO2 laser resurfacing — reported no safety problems, but also found no objective benefit over the control regimen [7]. There is no human safety data for injected GHK-Cu by any route [13]. That matters more than usual here, because the molecule carries copper: a systemic dose delivers a copper load, and no human toxicology study has measured what that load does.
Contraindications
- Wilson's disease or copper metabolism disorders
- Known allergy to copper or peptide components
- Active cancer or history of cancer
- Pregnancy or breastfeeding
- Children and adolescents
Which is right for you?
Choose Copper Tripeptide-1 (GHK-Cu) if...
- Individuals seeking comprehensive skin rejuvenation with antioxidant protection
- Those with wounds, scars, or post-procedural skin requiring accelerated healing
- People experiencing hair thinning who want to support follicle health
- Individuals looking for multi-pathway anti-aging through a single active ingredient
Choose GHK-Cu (Copper Peptide) if...
- Skin rejuvenation and anti-aging
- Wound and injury recovery
- Scar reduction
- Hair growth support