GHK-Cu
GHK-Cu is a naturally occurring copper-peptide complex made from the tripeptide glycyl-L-histidyl-L-lysine (GHK) bound to copper. It is best known for research and cosmetic interest involving skin quality, wound healing, extracellular matrix support, and hair-related applications. Most of the strongest evidence supports topical cosmetic / skin biology use and preclinical regenerative effects, while human clinical data remain limited and direct injectable use raises added regulatory and safety concerns.
Overview
GHK was first identified as a naturally occurring human peptide and is able to bind copper(II), forming GHK-Cu. Reviews describe it as a signaling peptide involved in tissue remodeling, collagen support, antioxidant activity, anti-inflammatory effects, and wound repair. It is widely used in skincare formulations, but many broader regenerative claims still rely mainly on laboratory and animal research rather than large controlled human trials.
What it is
GHK-Cu is a copper tripeptide complex. The peptide portion contains three amino acids: glycine, histidine, and lysine. PubChem lists Cu-GHK / GHK-Cu as a copper-containing peptide complex.
Mechanism (high level)
GHK-Cu appears to influence tissue repair and skin quality through multiple pathways, including support of collagen, elastin, and glycosaminoglycan synthesis, modulation of inflammatory and oxidative-stress signaling, and promotion of wound-healing and remodeling responses in dermal cells. Reviews also describe effects on angiogenesis- and regeneration-related pathways, though these mechanisms are better supported in preclinical work than in large human trials.
Quick facts
- Dosage
- There is no universally accepted evidence-based dose for GHK-Cu across skincare, hair, or regenerative use. Published human literature is stronger for topical cosmetic formulations than for standardized medical dosing, and FDA says human safety data are limited for injectable compounding.
- Route
- Topical cosmetic / skincare use has the strongest human-facing support. Injectable use is more compliance-sensitive, and FDA specifically warns that compounded injectable GHK-Cu may pose immunogenicity risk and that human safety data are limited.
- Cycle
- No standardized cycle has been established. In a facial-photoaging study cited in review literature, topical use was evaluated over 12 weeks.
- Storage
- Follow manufacturer or compounding-pharmacy instructions exactly Protect from heat and light Do not use beyond labeled storage limits Storage varies by formulation, especially between cosmetic topical products and compounded preparations.
Research indications
- Skin aging / photoaging research
- Skin firmness and elasticity support research
- Wound healing research
- Collagen and extracellular matrix research
- Hair-support research
- Scar and tissue-remodeling research
- Anti-inflammatory and antioxidant skin research
- Regenerative dermatology research
Research protocols (education)
Topical facial cream studied over 12 weeks in photoaged skin Topical cosmetic and dermatologic formulations dominate the human-facing literature Hair-related studies often involve combination treatments rather than GHK-Cu alone Many wound-healing data come from preclinical hydrogel, dressing, and laboratory models
A review summarizing earlier human cosmetic work reported that a GHK-Cu facial cream reduced visible signs of aging after 12 weeks in 71 women with photoaging. Hair and wound data are promising, but much of that literature is still preclinical or uses combination therapies.
Interactions
Often avoided with
- Unsupervised use of compounded injectable GHK-Cu
- Use when product source or sterility is uncertain
- Use with caution in known copper hypersensitivity
- Use with caution on severely irritated or broken skin unless clinician directed
- Pregnancy unless clinician supervised
- Breastfeeding unless clinician supervised
Often combined with
- Topical cosmetic use as directed
- Clinician-supervised investigational use
- Use with verified sourcing and clear labeling
- Skin and hair-support products with conservative expectations
Side effects & safety
- Limited human safety data for injectable use
- Potential immunogenicity risk with compounded injectable products
- Potential aggregation and peptide-impurity risk in injectable products
- Possible local skin irritation depending on formulation
- Product quality may vary across non-standardized sources
- Long-term systemic safety is not well established
Regulatory notes
- Not an FDA-approved drug
- FDA says compounded injectable GHK-Cu may pose significant safety risk
- Human safety data are limited for injectable compounding routes
- Topical cosmetic use is different from compounded injectable medical use
- Evidence is stronger for cosmetic / skin applications than for systemic therapeutic claims
FAQ
What is GHK-Cu?
GHK-Cu is a copper-bound tripeptide complex made from glycine, histidine, and lysine. It occurs naturally in the body and is widely studied for skin repair and cosmetic-aging applications.
What is GHK-Cu used for?
It is most commonly used in skincare and aesthetic contexts for skin quality, visible aging support, and related regenerative research. Broader claims about systemic healing remain less proven in humans.
Is GHK-Cu FDA approved?
No. GHK-Cu is not an FDA-approved drug, and FDA has specifically warned about safety risks with compounded injectable GHK-Cu products.
Is GHK-Cu good for skin?
The best-supported use case is skin-related. Reviews and cosmetic studies suggest it may support collagen-related remodeling, wound-healing biology, and visible improvement in photoaged skin with continued topical use
Is GHK-Cu banned in sports?
I did not find GHK-Cu specifically named on the current 2026 WADA Prohibited List. That is different from saying it is endorsed or risk-free for athletes; users in regulated sport should still verify directly against current anti-doping guidanc
Related in catalog
Track in app
Save favorites, compare protocols, and track over time
PepTok gives you structure: stacks, reminders, notes, and progress snapshots in one place.
Educational content only. This material is not medical advice. Verify legality, sourcing, and dosing with a qualified professional.