GHK-Cu

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What Is GHK-Cu?

GHK-Cu is a naturally-occurring tripeptide-copper complex, discovered by Loren Pickart in 1973 when investigating the anti-aging factor in human plasma. The three-amino-acid sequence glycyl-L-histidyl-L-lysine (GHK) has high affinity for copper ions (Cu²⁺), and the resulting GHK-Cu complex is the biologically active form found in plasma, saliva, and urine — declining from an average of 200 ng/mL at age 20 to under 80 ng/mL by age 60.

The peptide has a molecular weight of approximately 340 Da (free GHK) or 402 Da as the copper complex, with empirical formula C₁₄H₂₃CuN₆O₄. It is supplied as a high-purity lyophilized powder with the characteristic pale blue colour of the copper complex. GHK-Cu is for laboratory research use only and is not intended for human or veterinary diagnosis or therapy. For mechanism, genomic analysis, and published research summaries, see our full GHK-Cu research guide.

Mechanism of Action — Copper Carrier and Gene Regulator

GHK-Cu’s mechanism is unusually broad because the tripeptide functions both as a copper carrier (transporting Cu²⁺ into cells) and a gene-expression regulator acting on thousands of targets. Three mechanistic pathways dominate the published literature:

• Copper transport — GHK binds Cu²⁺ with high affinity and delivers it across cell membranes. Copper is a cofactor for lysyl oxidase (the enzyme that crosslinks collagen and elastin), superoxide dismutase, and cytochrome C oxidase. The copper-delivery mechanism is the unique feature distinguishing GHK-Cu from non-copper peptides.
• Fibroblast activation and collagen synthesis — GHK-Cu upregulates collagen types I and III, decorin, and glycosaminoglycans in dermal fibroblast research. This is the mechanistic basis of the skin, wound-healing, and connective-tissue research signal.
• Gene expression modulation — Pickart’s 2010 genomic analysis identified GHK as a modulator of approximately 4,000 human genes, with a net effect of shifting expression patterns toward a more youthful profile. Affected gene clusters include DNA-repair, antioxidant-defense, and stress-response pathways.

Because these three mechanisms operate across many tissue types, GHK-Cu has been investigated in research contexts ranging from dermatology and wound healing to gene-expression biology and neuronal survival research. It is remarkably well tolerated at typical research doses.

Published Research Applications

GHK-Cu is used in laboratory research contexts that investigate:

• Skin regeneration and photoaging — collagen type I and III synthesis, dermal-thickness, wrinkle-depth research in human and rodent models (Pickart, J Biomater Sci Polym 2008)
• Hair follicle research — follicular stem-cell activation and hair-cycle research in rodent models
• Wound healing — dermal-repair, chronic-wound, and diabetic-wound research (Pickart et al., Biomed Res Int 2015)
• Antioxidant and iron-chelation research — ROS reduction, lipid-peroxidation protection in cellular oxidative-stress models
• Gene expression research — whole-transcriptome analyses show modulation of ~4,000 human genes
• Neuronal research — neurite outgrowth and neuroprotection research in CNS cellular models
• Stacking research — commonly paired with BPC-157 και TB-500 in connective-tissue recovery research. See the best peptides for muscle recovery for cluster context.

Available Strengths

MedsBase stocks GHK-Cu in a single 50 mg lyophilized vial strength. Each variation ships in 10-vial, 20-vial, or 30-vial pack formats with full reconstitution guidance:

The 50 mg vial size reflects typical research protocol usage — 1–3 mg per administration, 1–2x daily or 3–5x weekly. A single 50 mg vial supports approximately 16–50 administrations depending on protocol. Supplied as lyophilized powder at 99%+ HPLC purity.

How It Compares — GHK-Cu vs Other Healing Peptides

GHK-Cu, BPC-157, and TB-500 are the three most-cited healing-research peptides. Each acts via distinct mechanisms, which is why they are frequently combined rather than substituted:

For broader context on the peptide landscape see the research peptides catalog.

Storage and Reconstitution

Before reconstitution: store lyophilized vials refrigerated at 2–8 °C in original packaging. Stable for up to 36 months. The lyophilized GHK-Cu has a characteristic pale blue colour from the copper complex.

Reconstitution procedure: inject bacteriostatic water down the side wall of the peptide vial. Solution should be clear light blue — the colour of the Cu²⁺ complex. Swirl gently — do δεν shake — and allow 2–5 minutes for full dissolution.

After reconstitution: store refrigerated at 2–8 °C and use within 30 days. Light-blue colour should persist; loss of colour may indicate copper-peptide dissociation. Discard if cloudy or discoloured (brown/green).

Συχνές Ερωτήσεις

What is GHK-Cu used for in research?

GHK-Cu is used in laboratory research investigating skin regeneration, hair follicle biology, wound healing, collagen synthesis, gene-expression modulation, and antioxidant pathways. It is δεν FDA-approved and is sold here strictly for laboratory research use only.

Why does GHK-Cu look blue?

The blue colour is the hallmark of the copper(II)-GHK complex. The Cu²⁺ ion coordinates with the histidine imidazole ring and deprotonated amide nitrogens of the tripeptide, producing the characteristic pale-blue absorption spectrum. A properly reconstituted GHK-Cu solution should be clear and light blue.

What is the typical GHK-Cu research dose?

Published preclinical protocols typically use 1–3 mg per administration, given once daily or 3–5 times per week for 4–8 week cycles. A 50 mg vial reconstituted with 5.0 mL bacteriostatic water yields 10 mg/mL — 10 ticks on a U-100 syringe delivers 1 mg.

Is GHK-Cu FDA approved?

No. GHK-Cu is not approved by the FDA, EMA, or any other regulator for therapeutic use. It is widely used in cosmetic skincare products as an ingredient, but the injectable research form sold here is for laboratory investigation only.

How should GHK-Cu be stored?

Lyophilized vials: refrigerated at 2–8 °C in original packaging, stable up to 36 months. Reconstituted solution: refrigerated at 2–8 °C, use within 30 days. The blue colour should persist throughout storage — loss of colour may indicate peptide-copper dissociation.

How do I reconstitute GHK-Cu?

Follow the reconstitution chart above. Add bacteriostatic water down the side wall of the vial, swirl gently, and allow 2–5 minutes for full dissolution. The solution should be clear light blue. Do δεν shake the vial.

Can GHK-Cu be stacked with BPC-157 or TB-500?

Yes. GHK-Cu is frequently co-administered with BPC-157 and/or TB-500 in connective-tissue, wound-healing, and skin-regeneration research because their mechanisms are complementary. GHK-Cu provides copper and gene-expression signaling; BPC-157 provides growth-factor upregulation; TB-500 provides systemic angiogenesis.

Is injectable GHK-Cu different from topical cosmetic GHK-Cu?

The peptide itself is the same molecule. Cosmetic formulations target skin absorption at low concentrations (typically 0.1–1%); injectable research forms deliver much higher doses systemically via SC injection for laboratory investigation. Our product is the injectable research form, not a cosmetic.

What strengths does MedsBase stock?

MedsBase carries GHK-Cu in 50 mg lyophilized vials, available in 10-vial, 20-vial, or 30-vial pack sizes. All vials are supplied at 99%+ HPLC purity with a certificate of analysis available on request.

Does GHK-Cu cause side effects in research?

Published preclinical research has reported a clean safety profile at typical research doses. Copper delivery is tightly regulated by the body’s endogenous transport proteins, which likely contributes to the low off-target signal. Long-term human safety data are not available.

What is the half-life of GHK-Cu?

GHK-Cu is a small tripeptide-copper complex with an estimated free-peptide plasma half-life of under 30 minutes. However, GHK demonstrates strong affinity for collagen, fibronectin, and other extracellular matrix proteins, which effectively extends its local tissue residence time considerably beyond plasma half-life measurements.

How does GHK-Cu work differently from growth-hormone secretagogue peptides?

Unlike GHRPs or GHRH analogs, GHK-Cu operates primarily through gene-expression modulation. Microarray studies have shown that GHK activates or suppresses over 4,000 human genes, including those governing collagen synthesis, antioxidant defence, nerve regeneration, and anti-inflammatory pathways. This broad genomic action distinguishes it from receptor-specific peptides such as BPC-157 or Ipamorelin.

Can I order GHK-Cu for international shipping?

Yes. MedsBase ships GHK-Cu worldwide from our dedicated peptide shipping network. Peptide-only orders qualify for our standalone peptide shipping service. Orders ship in temperature-controlled packaging with full tracking.

GHK-Cu is most often run alongside dedicated tissue-repair peptides for the deeper-tissue work; pair with our Peptide Healing Stack (BPC-157 5 mg + TB-500 5 mg + bacteriostatic water) for the angiogenesis + cytoskeletal layer that complements GHK-Cu’s collagen and antioxidant effects.

Other Peptides for Recovery and Performance Research

• BPC-157 — Body Protection Compound — tendon, ligament, gut recovery research
• TB-500 — Thymosin Beta-4 fragment — soft tissue and vascular recovery research
• Ipamorelin — Selective ghrelin agonist — clean GH pulse without cortisol/prolactin
• CJC-1295 with DAC — GHRH analog with extended half-life
• IGF-1 LR3 — Long-R3 IGF-1 analog — anabolic / regenerative research

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