OnePin Peptide Library · Repair & Recovery
GHK-Cu
Copper Peptide · Copper Tripeptide-1 · GHK Copper
GHK-Cu (glycyl-L-histidyl-L-lysine copper) is a naturally occurring copper-complexed tripeptide found in human plasma, saliva, and urine. Plasma levels decline significantly with age, from approximately 200 ng/mL at age 20 to 80 ng/mL by age 60. GHK-Cu plays a central role in extracellular matrix remodeling, collagen synthesis, antioxidant defense, and gene expression regulation. It delivers copper to lysyl oxidase, the enzyme responsible for cross-linking collagen types I and III into durable, organized fibers. GHK-Cu is discussed in the context of skin rejuvenation, wound healing, tissue remodeling, hair growth support, and as a component of multi-peptide repair protocols (GLOW and KLOW blends). The copper ion is integral to its function but creates specific syringe mixing considerations.
Draw FIRST in multi-compound syringes (mechanical contamination prevention - copper transfer to needle hub can oxidize partner-vial peptides on later piercings). Inject immediately after drawing. Best administered in the evening/bedtime. No fasting required.
Start here. Every protocol below is ordered lowest-first. Begin at the smallest effective dose, hold about a week to assess tolerance, and step up only if needed.
How it works
GHK-Cu delivers bioavailable copper(II) to lysyl oxidase and other copper-dependent enzymes critical for collagen cross-linking, elastin formation, and extracellular matrix integrity. Beyond its copper delivery role, GHK-Cu directly modulates gene expression, upregulating genes involved in tissue repair (collagen, decorin, metalloproteinases) while suppressing genes associated with inflammation and tissue destruction. It stimulates synthesis of collagen types I, III, and V, elastin, glycosaminoglycans, and proteoglycans. GHK-Cu also participates in redox homeostasis by regulating copper-dependent antioxidant enzymes (superoxide dismutase) and modulating iron metabolism. The tripeptide structure confers cell-penetrating ability, allowing intracellular gene expression effects beyond surface receptor signaling.
GHK-Cu delivers bioavailable copper(II) to lysyl oxidase and other copper-dependent enzymes critical for collagen cross-linking, elastin formation, and extracellular matrix integrity. Beyond its copper delivery role, GHK-Cu directly modulates gene expression, upregulating genes involved in tissue repair (collagen, decorin, metalloproteinases) while suppressing genes associated with inflammation and tissue destruction. It stimulates synthesis of collagen types I, III, and V, elastin, glycosaminoglycans, and proteoglycans. GHK-Cu also participates in redox homeostasis by regulating copper-dependent antioxidant enzymes (superoxide dismutase) and modulating iron metabolism. The tripeptide structure confers cell-penetrating ability, allowing intracellular gene expression effects beyond surface receptor signaling.
What to expect
Days 1-14: Minimal visible changes. GHK-Cu works through gene expression changes that take time to manifest in new protein synthesis. Injection tolerance is typically good.
Weeks 2-6: Skin texture and firmness improvements begin to appear. Wound healing acceleration becomes noticeable if recovering from injury or procedure. Hair quality changes may begin.
Weeks 6-12: Cumulative collagen and elastin synthesis produces visible skin improvements. Tissue remodeling effects become apparent. Scar tissue softening reported. Best results at 8-12 weeks of consistent use.
Evidence
The honest take
Anti-aging / skin rejuvenation
Human topical studies support improvement in skin thickness, fine lines, and firmness. Gene expression data shows broad anti-aging gene activation. One of the better-supported anti-aging claims for any peptide, at least topically.
Animal and in vitro data show hair follicle enlargement and stem cell activation. Anecdotal human reports support this. Not a validated hair loss treatment.
Microarray studies show GHK-Cu modulates approximately 4,000 human genes, many toward a younger expression pattern. This is well-documented in vitro data. In vivo significance at injectable doses is extrapolated.
Interactions & stacking
What's safe to combine, and what belongs in a separate pin.
Safe & synergistic
Keep separate
Side effects & safety
Commonly reported
- Mild injection site irritation (copper can cause local reaction)
- Slight blue-green discoloration at injection site (temporary, from copper)
- Generally very well tolerated systemically
Less common & notes
- GHK-Cu is a naturally occurring human peptide with an excellent safety profile.
- Copper overload is theoretically possible at very high doses but unlikely at standard peptide doses (total copper content per dose is micrograms).
- Individuals with Wilson's disease or copper metabolism disorders should avoid.
- Monitor copper and ceruloplasmin levels if using long-term at high doses.
Pharmacokinetics
Storage. Store unreconstituted vials frozen (-20C) or refrigerated (2-8C). After reconstitution, refrigerate at 2-8C. Stable for 28-30 days. Copper complex provides some structural stability. Solution may have slight blue tint (normal). Discard if cloudy or particles visible. Protect from light.
Regulatory status
GHK-Cu is available as a research peptide and through compounding pharmacies. Not FDA-approved for any indication. WADA status is not specifically addressed (unlikely to be tested for). Available in various topical cosmetic formulations without prescription.
Put it to work
Calculate, log & track
Open GHK-Cu straight into OnePin with your vial and dose pre-filled, then let it handle the syringe math and remind you before the vial runs out.
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The guide & community
The complete GHK-Cu walkthrough, real protocol discussion and coaching live inside the BlessUp community on Skool.
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