GHK-Cu
Copper Peptide GHK-Cu
GHK-Cu (glycyl-L-histidyl-L-lysine copper complex) is a naturally occurring tripeptide-copper complex found in human plasma, saliva, and urine that declines significantly with age. It is primarily used for skin rejuvenation, wound healing acceleration, and anti-aging applications, with emerging research into systemic effects including anti-inflammatory and tissue-remodeling properties.
Mechanism of Action
GHK-Cu binds copper ions and facilitates their cellular uptake, activating pathways that upregulate collagen, elastin, and glycosaminoglycan synthesis while simultaneously stimulating matrix metalloproteinases to remove damaged extracellular matrix proteins. It modulates gene expression by influencing over 30 genes involved in tissue remodeling, antioxidant defense (via superoxide dismutase activation), and anti-inflammatory signaling (downregulating TNF-α and IL-6). The complex also promotes angiogenesis through upregulation of VEGF and facilitates stem cell recruitment to sites of tissue damage.
Evidence by Health Goal(16 goals)
Dosing Protocols
Evening application preferred; can be used morning and night for anti-aging protocols
Most commercially validated route. Start at lower concentrations (0.1–0.5%) to assess tolerance. Allow product to fully absorb before applying additional skincare layers. Higher concentrations (1–2%) used in clinical wound care settings.
Morning or pre-workout; reconstitute with bacteriostatic water and inject subcutaneously
Cycle: 8–12 weeks on, 4 weeks off
Research-use only; not FDA-approved for systemic injection. Typically injected subcutaneously into abdominal or thigh tissue. Purity and sterility of source are critical. Human clinical data for this route is limited compared to topical use.
Safety & Side Effects
GHK-Cu has a favorable safety profile supported by decades of cosmetic and wound-care use, with topical formulations considered very low risk at standard concentrations (0.1–2%). Systemic subcutaneous use is less studied in humans and carries theoretical risks of copper toxicity with prolonged high-dose protocols; individuals with Wilson's disease or copper metabolism disorders should avoid this compound entirely.
Possible Side Effects
- !Local skin irritation, redness, or mild burning sensation at topical application site
- !Temporary skin purging or increased breakouts during initial weeks of topical use
- !Injection site reactions including redness, swelling, or bruising with subcutaneous use
- !Transient itching or rash, particularly with higher-concentration formulations
- !Potential copper accumulation with excessive systemic dosing over prolonged periods
- !Mild nausea reported anecdotally with higher subcutaneous doses
Interactions
- -May have additive collagen-stimulating effects when combined with retinoids — monitor for excess skin irritation
- -Theoretical interaction with copper-chelating agents (e.g., penicillamine, trientine) — may reduce efficacy of chelation therapy
- -May enhance wound-healing effects of platelet-rich plasma (PRP) or growth factor serums when used concomitantly
- -High-dose systemic use alongside zinc supplementation may create competitive copper-zinc absorption imbalance
- -Caution with immunosuppressants, as GHK-Cu's immune-modulating properties could theoretically interact with these agents
Cost & Where to Buy
Topical serums range from $20–$60/month depending on brand and concentration. Research-grade injectable GHK-Cu from peptide vendors typically costs $40–$120/month depending on dose and vendor. Pharmaceutical-grade formulations command premium pricing.
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