peptideNot FDA-approvedOTC supplementSold as a cosmetic ingredient, not a medicine
GHK-CuBenefits, Dosage & Interactions
Also known as: copper peptide
GHK-Cu, also known as copper peptide, is a naturally occurring small copper-binding peptide that has been identified in human plasma, saliva, and urine. It is composed of three amino acids—glycine, histidine, and lysine—bound to a copper (II) ion. Research on GHK-Cu focuses on tissue recovery and skin and hair.
How much GHK-Cu do people take?
Cosmetic studies applied topical formulations in the parts-per-million range; no injectable human dose-finding trial is published. Route reported: Topical in the published human work. Frequency reported: Once or twice daily in the cosmetic studies. These are amounts documented in the cited studies and labels for GHK-Cu — they are reported for reference, not a recommendation. Regulatory status differs by country, including between the US (FDA) and Canada (Health Canada). Confirm any amount with a licensed clinician before you take it.
See the full reported protocol and its sourcesResearched by DoseRoutine Research TeamReviewed for accuracy by Nicholas Alexander, RSE, SO, PMPLast updated Educational reference only — not medical advice. Always confirm dosing and safety decisions with a licensed clinician.
Evidence: Preclinical — Animal and in-vitro studies only, no published human RCTs.
Evidence strengthPreclinical · 1/4
PreclinicalStrong human evidence
Animal and in-vitro studies only, no published human RCTs.
Plasma half-life
Not established in humans
Default unit
mg
What published protocols report
Ranges documented in the literature, shown for reference. DoseRoutine does not recommend an amount — your prescriber or the product label sets the dose.
Reported for GHK-Cu in the cited sources. Published ranges are not dosing advice.
Mixing GHK-Cu: bacteriostatic water and syringe units
The vial arrives as dry powder. How much water you add sets the strength, and the strength sets the mark you draw to on the syringe. The table assumes a 50 mg vial and a 2 mg example draw on a U-100 insulin syringe, where 100 units is one millilitre. If your vial is a different size, scale it — the arithmetic is the same.
| Bacteriostatic water added | Resulting strength | 2 mg draws to |
|---|---|---|
| 1 mL | 50 mg/mL | 4 units |
| 2 mL | 25 mg/mL | 8 units |
| 3 mL | 16.67 mg/mL | 12 units |
Units, not millilitres. Insulin syringes are marked in units, and mixing up mcg and mg on a peptide label is the single most common error people report. Check the label twice. Run your own vial through the calculator.
Storage and stability
- Before mixing
- Sealed and still as a dry powder, GHK-Cu vials are normally kept in the fridge at 2–8 °C, out of light. Short spells at room temperature during shipping are the norm for lyophilized peptides and are not, on their own, a sign the vial is spoiled.
- After mixing
- Once bacteriostatic water goes in, the vial belongs in the fridge and is generally treated as good for about 28 days — that is how long the benzyl alcohol in bacteriostatic water is relied on to hold back bacterial growth. Plain sterile water has no preservative, so a vial mixed with it is a single-session vial. Never freeze a reconstituted vial.
- When to throw it out
- A properly mixed vial is clear. Cloudiness, floating strands, a color change or powder that will not go into solution after gentle swirling all mean the vial should be discarded rather than used. Shaking a peptide vial hard is the usual cause — swirl it, or run the water down the inside wall of the vial instead of onto the powder.
Handling and shelf-life figures describe general practice for lyophilized peptides. They are not a dose and not medical advice — your prescriber or the product label sets the amount.
References & evidence
Documents the GHK-Cu entry is written from. Each number matches an inline marker above.
- [1]GHK Peptide as a Natural Modulator of Multiple Cellular Pathways in Skin RegenerationPickart L, Margolina A · BioMed Research International · 2015 · Peer-reviewed · PMID 26236730
- [2]The human tri-peptide GHK and tissue remodelingPickart L · Journal of Biomaterials Science, Polymer Edition · 2008 · Peer-reviewed · PMID 18644225
- [3]The potential of GHK as an anti-aging peptidePickart L, Margolina A · Aging Pathobiology and Therapeutics · 2020 · Peer-reviewed · PMID 35083444
References & Evidence
Sources on this page that document GHK-Cu dosing, timing and safety.
- [1]National Center for Biotechnology Information View source
Educational information only — not medical advice. Dose ranges vary by person, indication and prescriber.
What is GHK-Cu studied for?
What is GHK-Cu?Sources for this section: Jumps to this entry in the sources and references list at the end of the page.
GHK-Cu, also known as copper peptide, is a naturally occurring small copper-binding peptide that has been identified in human plasma, saliva, and urine. It is composed of three amino acids—glycine, histidine, and lysine—bound to a copper (II) ion. First isolated in 1973 by Dr. Loren Pickart, GHK-Cu's presence in the body declines with age, as noted in research published in aging journals. This peptide plays various roles in human physiology, involving tissue remodeling, wound healing processes, and antioxidant defense. Its biological activity is largely attributed to its ability to modulate the expression of numerous genes involved in regenerative and protective pathways. GHK-Cu is often explored for its potential applications in dermatology and tissue repair due to observations from in vitro and in vivo studies. It is typically available in various formulations, including topical creams, serums, and solutions for injection. As a controlled compound, its use, especially in injectable forms, is under the purview of medical professionals.
What does the research say about GHK-Cu?
Tap a section to expand.
The mechanism of action for GHK-Cu is multifaceted, primarily stemming from its ability to carry and deliver copper to cells, where the copper ion acts as a cofactor for several enzymatic reactions critical for tissue repair and maintenance. Among its key actions, GHK-Cu can:
* **Modulate Gene Expression:** Studies have indicated that GHK-Cu can upregulate genes involved in collagen and elastin synthesis, extracellular matrix production, and antioxidant defense, while downregulating genes associated with tissue damage and inflammation. This broad gene modulatory effect contributes to its observed regenerative properties (as reported by PubChem).
* **Promote Wound Healing:** GHK-Cu influences various stages of wound healing, including attracting immune cells to the injury site, promoting angiogenesis (formation of new blood vessels), and stimulating the synthesis of extracellular matrix components like collagen and glycosaminoglycans. These actions collectively accelerate tissue regeneration as observed in animal models and in vitro studies.
* **Act as an Antioxidant and Anti-inflammatory Agent:** The peptide component of GHK-Cu, GHK, possesses intrinsic antioxidant properties. The copper ion, when delivered to appropriate enzymes such as superoxide dismutase, enhances the body's natural defense against oxidative stress. Furthermore, GHK-Cu exhibits anti-inflammatory effects by inhibiting the activity of various pro-inflammatory cytokines and pathways (research cited in review articles).
* **Remodel Tissue:** Beyond direct wound healing, GHK-Cu is involved in the remodeling of diverse tissues, including skin, bone, and nerve tissue. It aids in breaking down old, damaged tissue and replacing it with new, healthy tissue, which is a process vital for maintaining tissue integrity and function (general biological understanding of peptides in tissue repair).
* **Enhance Cellular Proliferation and Migration:** GHK-Cu has been shown to stimulate the proliferation and migration of fibroblasts, keratinocytes, and endothelial cells, which are crucial cell types for wound closure and tissue regeneration (data from cell culture studies).
Source for this section: Sources for How does GHK-Cu work?: Jumps to this entry in the sources and references list at the end of the page.
Research into GHK-Cu has explored several potential benefits, primarily centered on its roles in tissue regeneration, anti-aging, and protective capacities:
* **Skin Health and Anti-Aging:** GHK-Cu is widely studied for its dermatological applications. In vitro and some human studies suggest it may improve skin elasticity, firmness, and reduce the appearance of fine lines and wrinkles by promoting collagen and elastin synthesis. It is also thought to protect skin cells from UV radiation and environmental damage through its antioxidant capabilities (findings summarized by NIH ODS).
* **Wound Healing:** Numerous studies, particularly in animal models and cell cultures, have demonstrated that GHK-Cu can accelerate wound healing, including incisional wounds, burns, and chronic ulcers. This effect is attributed to its ability to stimulate collagen production, angiogenesis, and anti-inflammatory responses (reported in various medical research journals).
* **Hair Growth:** Some preliminary research and anecdotal reports suggest GHK-Cu may stimulate hair growth and reduce hair loss by improving the health of hair follicles and increasing blood circulation to the scalp. However, robust human clinical trials are currently limited (observations from early-stage research).
* **Anti-inflammatory Effects:** GHK-Cu exhibits anti-inflammatory properties, which may contribute to its benefits in wound healing and potentially in conditions involving chronic inflammation. It can modulate inflammatory cytokines and reduce tissue damage associated with inflammation (as noted in pharmacology reviews).
* **Antioxidant Protection:** By delivering copper to antioxidant enzymes and possessing intrinsic antioxidant properties, GHK-Cu helps to neutralize free radicals, thereby reducing oxidative stress and protecting cells from damage, which is relevant for overall tissue health and disease prevention (general understanding of antioxidants).
The evidence for GHK-Cu's effects largely stems from laboratory research (in vitro studies), animal models, and some limited human clinical trials, particularly in the dermatological field. For instance, topical applications of GHK-Cu have been investigated for skin rejuvenation, with studies showing improvements in skin elasticity and firmness, as detailed in reports available through PubChem and academic dermatological journals. These studies often compare GHK-Cu to other anti-aging ingredients, indicating comparable or superior effects on certain skin parameters as reported in peer-reviewed literature. In wound healing, evidence from animal models consistently demonstrates that GHK-Cu can accelerate the closure of various types of wounds, including excisional wounds and burns. These findings often show enhanced collagen production, improved angiogenesis, and reduced inflammation at the wound site, as documented in pre-clinical research from organizations like NIH. While these preclinical data are promising, comprehensive, large-scale human clinical trials are still ongoing or needed to fully establish the efficacy and optimal use of GHK-Cu for many of its purported benefits. For injectable forms, evidence of direct systemic benefits beyond topical application, particularly in humans, is still emerging and subject to ongoing scientific inquiry. Cochrane reviews on peptides for specific conditions may offer additional context for related compounds, though direct comprehensive reviews for GHK-Cu are yet to be widely published.
Reported side effects associated with GHK-Cu are generally mild, especially with topical application, but can vary depending on the route of administration and individual sensitivity. When applied topically, potential side effects may include:
* **Skin Irritation:** Redness, itching, stinging, or a rash at the application site.
* **Allergic Reactions:** Though rare, individuals may experience allergic contact dermatitis. This is typically observed soon after initial use.
* **Temporary Discoloration:** Some users have reported a temporary blue tint to the skin if high concentrations are used or if the product is not properly absorbed, due to the copper content.
For injectable forms of GHK-Cu, which are less commonly studied in general literature and typically administered in controlled medical settings, side effects could potentially include:
* **Injection Site Reactions:** Pain, soreness, redness, swelling, or bruising at the site of injection.
* **Systemic Effects:** While rare, theoretical concerns for systemic copper overload or other undefined reactions might exist depending on dose and individual health status. However, these are not well-documented in publicly available literature beyond theoretical considerations.
Patients should report any adverse reactions to their healthcare provider. This is educational information, not medical advice — consult a qualified clinician before starting, stopping or combining any compound.
Individuals considering GHK-Cu should be aware of several warnings:
* **Allergic Reactions:** Individuals with known allergies to similar peptides or copper should exercise caution. A patch test is often recommended for topical products containing GHK-Cu before widespread application.
* **Pregnancy and Breastfeeding:** There is insufficient data to determine the safety of GHK-Cu during pregnancy or breastfeeding. Therefore, use is generally not recommended in these populations. Consult with a healthcare professional.
* **Pre-existing Medical Conditions:** Individuals with certain medical conditions, especially those related to copper metabolism (e.g., Wilson's disease) or other systemic illnesses, should consult a clinician before using GHK-Cu, particularly if considering higher doses or non-topical forms. The body's copper regulation is complex.
* **Product Quality and Purity:** The market for GHK-Cu products can vary significantly in terms of quality, concentration, and purity. It is crucial to source products from reputable manufacturers. Unregulated products may contain contaminants or incorrect dosages.
* **Dosage and Administration:** No universally accepted standardized dosage guidelines exist for GHK-Cu for many of its potential applications. For injectable forms, dose is user-directed and must be set by a licensed clinician. Self-administration of injectable compounds carries inherent risks and should only be done under medical supervision.
This is educational information, not medical advice — consult a qualified clinician before starting, stopping or combining any compound.
While generally considered to have a favorable safety profile for topical use, GHK-Cu may be contraindicated in certain situations:
* **Known Allergy or Hypersensitivity:** Individuals with a confirmed allergy or hypersensitivity to GHK-Cu, copper, or any components of GHK-Cu containing products should avoid its use. Symptoms may include severe skin irritation, rash, or systemic allergic reactions.
* **Wilson's Disease:** This genetic disorder leads to excessive copper accumulation in the body. Individuals with Wilson's disease or other disorders of copper metabolism should strictly avoid GHK-Cu, especially systemic forms, due to the potential for exacerbating copper toxicity.
* **Broken or Severely Damaged Skin (for topical application):** While GHK-Cu is studied for wound healing, applying highly concentrated topical formulations to severely compromised skin without medical guidance could potentially lead to increased systemic absorption or irritation. Usage on open wounds should always be medically supervised.
* **Unspecified Medical Conditions:** Given that GHK-Cu is a controlled compound, specific contraindications for systemic use may be determined by a licensed clinician based on a patient's full medical history and current health status. It is paramount to disclose all health conditions to a clinician.
This is educational information, not medical advice — consult a qualified clinician before starting, stopping or combining any compound.
The interaction profile of GHK-Cu with other compounds is not extensively documented in large-scale clinical trials, particularly for systemic use. However, based on its chemical properties and biological actions, some potential interactions and prudent considerations include:
* **Acidic Products (for topical use):** GHK-Cu is a peptide that can be denatured or rendered less effective in highly acidic environments. When used topically, it may be advisable to avoid mixing or immediately layering with highly acidic products (e.g., strong AHAs, high concentration Vitamin C in ascorbic acid form) which could potentially degrade its structure or reduce its stability. Apply GHK-Cu at a different time of day or allow ample absorption time between applications.
* **Chelating Agents:** Compounds that strongly chelate copper could theoretically interfere with GHK-Cu's activity by removing the copper ion. This is more of a theoretical concern and not broadly documented in clinical interactions.
* **Other Peptides:** While it is commonly combined with other peptides in cosmetic formulations, there is limited research on complex interactions. Clinicians might advise caution or observe for heightened sensitivity when combining multiple active peptides, especially in concentrated forms or through systemic routes.
* **Systemic Medications Affecting Copper Metabolism:** For injectable forms, extreme caution is advised for individuals taking medications known to affect copper levels or metabolism. An example might be zinc supplements taken at very high doses over time, as zinc can interfere with copper absorption. However, this interaction is typically managed in a clinical setting.
This is educational information, not medical advice — consult a qualified clinician before starting, stopping or combining any compound.
The typical timing for GHK-Cu application or administration depends significantly on the form and intended use. For topical formulations (creams, serums), GHK-Cu is commonly applied once or twice daily to clean skin. Many users integrate it into their morning or evening skincare routine. If used alongside other active skincare ingredients, it is often recommended to apply GHK-Cu at a different time of day or to allow sufficient absorption time between products, particularly with acidic compounds, as discussed in the 'Do Not Mix' section. For injectable GHK-Cu, there is no universally established typical timing, as dosages and frequency are strictly user-directed and must be set by a licensed clinician based on the specific condition being addressed, the individual's health status, and the clinician's therapeutic approach. Administration can be daily, several times a week, or as otherwise prescribed. It is important to adhere strictly to professional medical guidance when using injectable forms. GHK-Cu can be taken with or without food for systemic applications, as there is no specific food interaction noted to significantly alter its absorption or efficacy.
Source for this section: Sources for When should you take GHK-Cu?: Jumps to this entry in the sources and references list at the end of the page.
Put it into practice
Reading about GHK-Cu is the first step — DoseRoutine helps you act on it. These free tools turn what you just learned into a routine.
What interacts with GHK-Cu?
| Interacts with | Severity | Type | What happens | What to do |
|---|---|---|---|---|
| Any peptide + hormone | Note | Category ruleConfidence: theoretical | Injectable peptides plus hormones can have overlapping or compounding effects that aren't always well characterized.Source pending | Track bloodwork with a provider; don't assume combinations are neutral. |
Frequently asked questions about GHK-Cu
GHK-Cu is a naturally occurring copper-binding peptide, meaning it's a small protein fragment made of three amino acids (glycine, histidine, lysine) that carries a copper ion. It's found in human plasma, saliva, and urine, and its levels decrease with age. It plays roles in tissue repair, wound healing, and antioxidant defense.
GHK-Cu works primarily by delivering copper to cells, where the copper acts as a vital cofactor for many enzymes involved in tissue regeneration. It also modulates gene expression to promote collagen and elastin synthesis, has anti-inflammatory properties, and acts as an antioxidant, contributing to its roles in skin health and wound healing.
GHK-Cu is primarily studied and used for its potential benefits in skin health (reducing wrinkles, improving elasticity), wound healing (accelerating repair), and hair growth. It's also recognized for its anti-inflammatory and antioxidant properties, which contribute to its overall regenerative effects.
Side effects are generally mild, especially with topical use, and may include temporary skin irritation, redness, or a rare allergic reaction. Injectable forms, which require medical supervision, may cause temporary discomfort at the injection site. Individuals with specific copper metabolism disorders, like Wilson's disease, should avoid GHK-Cu. Always consult a clinician for personalized advice.
For topical use, GHK-Cu can often be integrated into skincare routines. It is generally advisable to avoid direct mixing or immediate layering with highly acidic products (e.g., strong Vitamin C serums) as this might affect its stability. Applying GHK-Cu at a different time of day or allowing sufficient absorption time between products is a common recommendation.
Interaction risk for GHK-Cu comes from the rest of the stack: other peptides, prescription medicines, hormone therapy and peptides. Risk depends on dose, timing and what else is taken the same day, so each pairing has to be checked rather than assumed safe. The free checker at https://doseroutine.com/interaction-checker covers GHK-Cu with no sign-up.
GHK-Cu is administered by injection, so the measured volume — not a tablet count — is the unit that matters. It is a controlled substance in some jurisdictions, so the prescribed amount is the only appropriate one. Published ranges differ between studies and formulations — the dose to use is the one on your label or from your clinician.
There is no single answer for GHK-Cu plus TRT. What matters is the specific protocol you are on and what your most recent hormone panel shows. No general contraindication applies across every TRT protocol, so confirm the combination with the prescribing clinician. See the free TRT interaction reference: https://doseroutine.com/trt-supplement-interactions
Pairing GHK-Cu with peptides has to be assessed one peptide at a time, because GLP-1 agonists, secretagogues, healing peptides and melanocortins do not share an interaction profile. Check the combination peptide by peptide rather than as one group, and review it with a clinician familiar with peptide protocols.
Published frequency for GHK-Cu varies by protocol and formulation, so the label or prescription is what sets it. Frequency is a clinical decision, not a fixed rule — confirm it with the prescriber or product label. Comparison of apps that keep a schedule like this: https://doseroutine.com/best-dose-tracking-apps
The effect of a missed dose of GHK-Cu depends on the protocol and formulation you are on. For injectable protocols, shifting the next injection is usually preferred over doubling it. Follow the missed-dose instructions on your label or from your clinician, and log the miss so the pattern is visible later rather than forgotten.
For an injectable like GHK-Cu the record needs more than a checkbox: vial concentration, the measured volume, and which site the last injection went into. A written log or spreadsheet works for planning but does not remind you or flag conflicts — see the honest comparison at https://doseroutine.com/vs/spreadsheet and the wider roundup at https://doseroutine.com/best-dose-tracking-apps — DoseRoutine tracks the schedule, the remaining supply and interactions with the rest of your routine in one place.
Cosmetic studies applied topical formulations in the parts-per-million range; no injectable human dose-finding trial is published. Route reported: Topical in the published human work. Frequency reported: Once or twice daily in the cosmetic studies. These are amounts documented in the cited studies and labels for GHK-Cu — they are reported for reference, not a recommendation. Regulatory status differs by country, including between the US (FDA) and Canada (Health Canada). Confirm any amount with a licensed clinician before you take it.
Which studies looked at GHK-Cu?
Peer-reviewed research indexed in PubMed. Each entry links to the original record.
- 1.Regenerative and Protective Actions of the GHK-Cu Peptide in the Light of the New Gene Data(opens PubMed in a new tab)Int J Mol Sci · 2018 · PMID 29986520 · https://pubmed.ncbi.nlm.nih.gov/29986520/
- 2.Therapeutic Peptides in Orthopaedics: Applications, Challenges, and Future Directions(opens PubMed in a new tab)J Am Acad Orthop Surg Glob Res Rev · 2026 · PMID 41490200 · https://pubmed.ncbi.nlm.nih.gov/41490200/
- 3.Injectable Peptide Therapy: A Primer for Orthopaedic and Sports Medicine Physicians(opens PubMed in a new tab)Am J Sports Med · 2026 · PMID 41476424 · https://pubmed.ncbi.nlm.nih.gov/41476424/
- 4.The human tri-peptide GHK and tissue remodeling(opens PubMed in a new tab)J Biomater Sci Polym Ed · 2008 · PMID 18644225 · https://pubmed.ncbi.nlm.nih.gov/18644225/
- 5.Are We Ready to Measure Skin Permeation of Modern Antiaging GHK-Cu Tripeptide Encapsulated in Liposomes?(opens PubMed in a new tab)Molecules · 2025 · PMID 39795193 · https://pubmed.ncbi.nlm.nih.gov/39795193/
Sources cited on this page
Specific documents referenced by the numbered markers above. Each number matches the marker in the text.
- PubChem CID 9831891(opens in a new tab)National Center for Biotechnology Information · pubchem.ncbi.nlm.nih.gov/compound/9831891
Verify at
Publisher search links for GHK-Cu. These are places to check the information — they are not citations, so they are not numbered.
- NIH Office of Dietary Supplements(publisher search, opens in a new tab)National Institutes of Health · publisher search
- Mayo Clinic(publisher search, opens in a new tab)Mayo Clinic · publisher search
- Examine.com(publisher search, opens in a new tab)Examine.com · publisher search
- DrugBank(publisher search, opens in a new tab)DrugBank Online · publisher search
- PubMed literature search(publisher search, opens in a new tab)National Library of Medicine · publisher search
- DailyMed labeling archive(publisher search, opens in a new tab)U.S. National Library of Medicine · publisher search
- Wikipedia entry(publisher search, opens in a new tab)Wikipedia · publisher search
DoseRoutine compiles summaries from publicly available scientific and regulatory references. Always verify important decisions with a licensed clinician. How we source and review this information.
What is the short answer on GHK-Cu?
Plain-text summary, safe to quote verbatim:
GHK-Cu, also known as copper peptide, is a naturally occurring small copper-binding peptide that has been identified in human plasma, saliva, and urine. It is composed of three amino acids-glycine, histidine, and lysine-bound to a copper (II) ion. Research on GHK-Cu focuses on tissue recovery and skin and hair.
Source: DoseRoutine — https://doseroutine.com/library/ghk-cu
GHK-Cu cheat sheet
DoseRoutine cheat sheet · Peptide
GHK-Cu
GHK-Cu, also known as copper peptide, is a naturally occurring small copper-binding peptide that has been identified in human plasma, saliva, and urine. It is composed of three amino acids—glycine, histidine, and lysine—bound to a copper (II) ion.
Evidence
Preclinical
Animal and in-vitro studies only, no published human RCTs.
Studied range
Cosmetic studies applied topical formulations in the parts-per-million range; no injectable human dose-finding trial is published
Route
Topical in the published human work
Frequency studied
Once or twice daily in the cosmetic studies
Half-life
Not established in humans
Storage
Protected from light; copper complexes oxidize
Not FDA-approvedOTC supplementSold as a cosmetic ingredient, not a medicineRecoverySkin Hair
Studied ranges, not dosing advice. Not medical advice — talk to a clinician. doseroutine.com/library/ghk-cu
Cite this page
Using this in an article, AI answer, or research note? Please attribute:
DoseRoutine. (2026). GHK-Cu — Overview, Benefits & Side Effects. Retrieved from https://doseroutine.com/library/ghk-cu
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