GHK-Cu: research protocol, dosing & reconstitution
Also known as: Copper Peptide, Copper tripeptide-1
Quick answer
What is GHK-Cu?
GHK-Cu is a small copper-binding peptide naturally present in human plasma that declines sharply with age. It is studied for skin remodeling, wound healing, and hair growth — mostly in topical research — and is the flagship compound of the cosmetic peptide category.
What GHK-Cu is
GHK-Cu (copper tripeptide-1) is a three-amino-acid peptide — glycine, histidine, lysine — bound to a copper ion. It occurs naturally in human plasma at levels that drop roughly 60% between age 20 and 60, which is the origin of the anti-aging research interest.
It appears in two research forms: topical (creams and serums, widely studied in cosmetic science) and injectable lyophilizedLyophilizedFreeze-dried. Peptides are shipped as a lyophilized powder ('puck') because the dry form is far more stable than a solution. It must be reconstituted before use in research.See glossary → vialsVialThe small sealed glass container peptides are supplied in, topped with a rubber septum that a syringe needle can pass through.See glossary →, commonly 50 mg or 100 mg, used in research contexts. It has a distinctive blue color from the copper.
Mechanism of action
GHK-Cu delivers copper into cells and modulates gene expression broadly — published gene-profiling work reports it resets numerous genes toward a more regenerative state, stimulating collagen and glycosaminoglycan synthesis while dampening inflammatory signaling [1].
In skin studies, topical GHK-Cu has been reported to improve firmness, elasticity, and photoaging markers; in wound models it accelerates closure and remodeling.
What researchers study GHK-Cu for
- Skin remodeling, firmness, and photoaging research (topical)
- Wound-healing models
- Hair-follicle stimulation research
- Anti-inflammatory and gene-expression studies
What dose of GHK-Cu do researchers use?
Research literature commonly references doses of 1–2 mg per day (injectable research); varies widely topically. This is not a recommendation — the table below summarizes protocols as they appear in published literature and trial designs.
| Context | Dose | Frequency | Duration |
|---|---|---|---|
| Injectable research reference | 1–2 mg | Once daily | 3–4 week cycles referenced |
| Topical research reference | Varies widely by formulation | Daily application | 8–12 weeks in cosmetic studies |
← Swipe to see the full table
Half-life and dosing timing
Half-life: Short. Route referenced in research: Topical or subcutaneous (research). Half-lifeHalf-lifeHow long it takes for half of a compound to be eliminated from the body. Half-life determines how often researchers dose a compound in protocols.See glossary → is short; injectable research protocols reference once-daily administration. Topical studies apply daily, with outcomes measured over 8–12 weeks.
Titration: start low, go slow
Injectable protocols in the literature start at 1 mg daily and hold before moving to 2 mg — copper delivery is the active principle, and more is not better.
Skip the GHK-Cu math
Enter vial size, water volume, and target dose — the free calculator returns concentration, injection volume, and exact U-100 syringe units.
How is GHK-Cu reconstituted?
| Vial size | BAC water | Concentration | Worked example |
|---|---|---|---|
| 50 mg | 5 mL | 10 mg/mL | 1.5 mg = 0.15 mL = 15 units on a U-100 syringe |
| 100 mg | 5 mL | 20 mg/mL | 2 mg = 0.1 mL = 10 units on a U-100 syringe |
Add 5 mL of bacteriostatic waterBAC water (bacteriostatic water)Sterile water containing 0.9% benzyl alcohol, which suppresses bacterial growth. It is the standard diluent used to reconstitute lyophilized peptides for multi-dose research vials.See glossary → to a 50 mg vial: 50 ÷ 5 = 10 mg/mL. A 1.5 mg dose is 1.5 ÷ 10 = 0.15 mL — 15 units on a U-100 syringeU-100 syringeAn insulin syringe calibrated so that 100 units equal 1 mL. The standard syringe referenced in peptide research; each unit equals 0.01 mL.See glossary →.
New to the process? Read the full step-by-step reconstitution guide.
How long does reconstituted GHK-Cu last?
Lyophilized: refrigerate. ReconstitutedReconstitutionThe process of mixing a freeze-dried (lyophilized) peptide powder with bacteriostatic water to create a solution of known concentration.See glossary →: refrigerate and use within weeks. The copper complex is comparatively stable, but standard cold-and-dark handling still applies.
What is GHK-Cu stacked with in research?
In cosmetic research, topical GHK-Cu is layered with standard skincare actives (avoid combining with strong acids in the same application, which can strip the copper). Injectable research sometimes references it alongside longevity-focused compounds.
Side effects observed in research
Topical: occasional skin sensitivity. Injectable: injection-site irritation is the main report. Copper overload is a theoretical concern at excessive doses — another reason literature protocols stay conservative.
- Injection-site irritation
- Skin sensitivity (topical)
Frequently asked questions
Why is GHK-Cu blue?
The copper ion bound to the peptide gives the solution its characteristic blue color — a normal property, not a defect.
Is topical or injectable GHK-Cu more studied?
Topical, by a wide margin. Most published human data is cosmetic — skin firmness, elasticity, photoaging — while injectable use is a research context with far less data.
What dose appears in injectable research?
Literature references 1–2 mg once daily in short cycles. This describes research protocols, not a recommendation.
Does GHK-Cu help hair growth?
Research interest exists — GHK-Cu is studied for stimulating hair follicles, and copper peptides appear in commercial hair-care formulas — but controlled human data remains limited.
Related research peptides
BPC-157
A synthetic peptide fragment studied for tissue repair, tendon/ligament and gut healing in animal research.
Healing & RecoveryTB-500
A synthetic version of a region of Thymosin Beta-4, studied for cell migration, angiogenesis and tissue repair.
Growth Hormone SecretagogueCJC-1295
A growth-hormone-releasing hormone analog studied for stimulating GH release; often blended with Ipamorelin.
Browse all Skin & Longevity peptides or start with the beginner’s guide to research peptides.
References
- 1.Pickart L, Margolina A. Regenerative and Protective Actions of the GHK-Cu Peptide in the Light of the New Gene Data. Int J Mol Sci. 2018. PubMed ↗