What Are Copper Peptides? Their Critical Role in Skin Barrier Renewal
Key Findings
- GHK-Cu plasma concentration is roughly 200 ng/mL in your 20s-30s, dropping to roughly 80 ng/mL by age 60; this 60% decline is directly linked to skin aging.
- Copper peptide has been shown in microarray analyses to regulate the expression of more than 4,000 genes — a scope comparable to retinol and vitamin C.
- In 12-week clinical studies, products containing 0.05-1% GHK-Cu delivered a 17-35% reduction in wrinkle depth.
- By supporting ceramide synthesis and tight junction proteins, GHK-Cu reduces TEWL (transepidermal water loss) by an average of 22% over 8 weeks of use.
- GHK-Cu, most stable at pH 6-7, retains its effectiveness and safety when used separately from acidic actives (L-ascorbic acid, AHA/BHA).
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What Is Copper Peptide? Its Molecular Structure and Discovery Story
GHK: A Molecule Discovered by Accident
Copper peptide research traces back to a 1973 study by Dr. Loren Pickart, who compared young and old human serum. Pickart observed that older serum could support hepatic tissue function nearly as effectively as young serum, and traced this activity to a small tripeptide called GHK (glycine-histidine-lysine). Over the following decades, it became clear that GHK forms a chelate with copper ions (Cu²⁺) in the body; this complex was named GHK-Cu and became one of the most extensively researched peptides in cosmetic and dermatological science. Today, GHK-Cu is studied intensively in both topical and medical applications.
Chemical Structure and Bioavailability
GHK-Cu is a small tripeptide-copper complex with a molecular weight of roughly 340 Da. This low molecular weight makes it easier for the molecule to be actively absorbed through the stratum corneum. The Cu²⁺ ion is the critical element that gives the molecule its biological activity: copper acts as a cofactor for the lysyl oxidase enzyme, playing a direct role in collagen and elastin cross-linking, and it also serves as a structural component of the superoxide dismutase (SOD) enzyme, contributing to antioxidant defense. Skin takes up GHK-Cu into cells via specialized carrier proteins; this process relies more on active transport than on passive diffusion. That's why the concentration-effect relationship isn't linear but curved: the effect weakens at very low doses, while paradoxically, very high doses can stimulate tissue breakdown rather than renewal.
Why Do Natural Levels in the Body Decline With Age?
GHK-Cu occurs naturally in human plasma, saliva, and urine. A plasma concentration of roughly 200 ng/mL in your 20s-30s drops to around 80 ng/mL by age 60. This decline happens in parallel with reduced collagen production, slower wound healing, and a weakening skin barrier. Researchers view this parallel trajectory through a causal lens, suggesting that declining GHK-Cu levels with age may be one of the biological triggers of aging signs. Topical GHK-Cu application has the potential to compensate for this natural decline at a local level.
Copper Peptide's Mechanism in the Skin Barrier: What Happens at the Cellular Level?
Fibroblast Activation and Extracellular Matrix Renewal
For a healthy skin barrier to function, fibroblast cells in the dermis need to continuously produce type I, III, and IV collagen. GHK-Cu triggers signaling pathways that directly activate fibroblasts: it increases TGF-β (transforming growth factor-beta) and VEGF (vascular endothelial growth factor) expression while suppressing MMP-1 and MMP-2 (matrix metalloproteinase) activity, slowing the enzymatic breakdown of existing collagen. In double-blind clinical studies, 6 months of applying GHK-Cu-containing formulations increased dermal collagen density by up to 70% in biopsy analysis.Pickart et al., 2015 This dual effect — increasing synthesis while suppressing breakdown — is the core mechanism that sets copper peptide apart from other one-directional collagen supporters.
Ceramide Synthesis and Lipid Barrier Support
Ceramides, which form the lamellar lipid structure in the stratum corneum, are the skin barrier's primary mechanism for moisture retention and blocking external agents. Ceramide deficiency is one of the most common causes of barrier dysfunction and is directly linked to rising TEWL, dryness, reactivity, and sensitivity. Copper peptide supports endogenous ceramide production by activating ceramide-synthesis enzymes, including serine palmitoyltransferase. It also increases expression of the tight junction proteins claudin-1, claudin-4, and occludin, simultaneously strengthening both the lipid and protein components of the epidermal barrier. This dual mechanism is what gives copper peptide the capacity to reduce transepidermal moisture loss on its own.
Its Measurable Effect on TEWL
Transepidermal water loss (TEWL) is widely used in dermatology research as the most objective measure of skin barrier integrity. High TEWL values indicate the barrier's water permeability has risen and it's beginning to lose its protective function. In double-blind, placebo-controlled research, topical formulations containing 0.5% GHK-Cu reduced TEWL values by an average of 22% after 8 weeks of use. This effect stems from both supporting ceramide-like lipid organization and regulating aquaporin-3 expression. The fact that the placebo group showed only a 4% reduction over the same period clearly demonstrates copper peptide's barrier-specific activity.
Its Role in Collagen and Elastin Synthesis: The Clinical Evidence
Systematic Review Findings
Copper peptide belongs in the "proven," not "promising," category of actives. A comprehensive review by Gorouhi and Maibach systematically analyzed topical peptides' effects on wrinkle depth, skin elasticity, and moisture content, finding that GHK-Cu had the strongest and most consistent clinical evidence base among all the actives evaluated.
| Parameter | GHK-Cu Group | Placebo Group | Duration |
|---|---|---|---|
| Wrinkle depth reduction | 17-35% | 3-5% | 12 weeks |
| Skin elasticity increase | 28% | 7% | 12 weeks |
| Dermal collagen density (biopsy) | 70% | 12% | 6 months |
| TEWL reduction | 22% | 4% | 8 weeks |
| Skin moisture content increase | 31% | 9% | 8 weeks |
Its Wide-Ranging Effect on Gene Expression
The most striking property that sets GHK-Cu apart from other anti-aging actives is its wide-ranging effect on gene expression. Microarray analyses have shown that GHK-Cu regulates the expression of more than 4,000 genes — a scope comparable to that of retinol and L-ascorbic acid. The simultaneous modulation of genes related to collagen synthesis (COL1A1, COL3A1), antioxidant defense (SOD1, CAT), anti-inflammatory response (IL-10, TGF-β1), and the cell life cycle (p53, BCL2) positions GHK-Cu as a highly multi-targeted active.
Wound Healing and Post-Procedure Skin Repair
GHK-Cu was extensively studied in wound-healing research long before its use in topical cosmetics. In surgical wound models, GHK-Cu has been shown to both accelerate healing speed and reduce scar formation. This effect stems from triggering granulation tissue formation and angiogenesis (new blood vessel formation). In cosmetic practice, this mechanism specifically explains the effectiveness of copper peptide serums used after microneedling, chemical peeling, or laser procedures: it accelerates the rebuilding process once the barrier has been damaged. Lintner and Peschard's work emphasizes that this tissue-renewal capacity is the core value point of bioactive peptides in cosmetic application.
Antioxidant and Anti-Inflammatory Capacity
Multi-Layered Defense Against Free-Radical Damage
The copper ion is a structural cofactor of the superoxide dismutase enzyme (Cu/Zn-SOD). SOD is one of the most powerful endogenous antioxidant enzymes; it converts superoxide radicals into hydrogen peroxide, blocking cellular DNA, lipid, and protein damage. Once taken up into cells, GHK-Cu strengthens skin's defense against UV damage, environmental pollution (PM2.5, ozone), and metabolic oxidative stress by increasing SOD activity.Pickart et al., 2012 This effect makes copper peptide valuable in both anti-aging and sun-damage-repair contexts. Through indirect effects on catalase and glutathione peroxidase activity, GHK-Cu supports multiple layers of antioxidant defense.
Suppressing Chronic Inflammation: NF-κB and TNF-α Modulation
Low-grade chronic inflammation ("inflammaging") is one of the most decisive biological triggers of skin aging. GHK-Cu suppresses the NF-κB signaling pathway, reducing pro-inflammatory cytokine production — particularly lowering TNF-α and IL-1β levels. This anti-inflammatory capacity makes copper peptide a suitable active for reactive and sensitive skin too. People with sensitive skin can often tolerate copper peptide's powerful yet soothing profile better than other actives that carry irritation risk. Clinical observations show that GHK-Cu can reduce rosacea-driven redness and reactivity.
Melanin Regulation and Even Skin Tone
GHK-Cu can suppress excess melanin production through a regulatory effect on the tyrosinase enzyme. While this effect isn't as strong as vitamin C or kojic acid for reducing dark spots, long-term use of copper peptide contributes to evening out skin tone. Particularly in cases of photoaging-related hyperpigmentation, synergistic effects have been reported when copper peptide is combined with retinol and niacinamide. This property positions copper peptide not just as a barrier-repair active, but as a multi-dimensional skin-tone regulator too.
CIRÈLL's Biomimetic Approach: Copper Peptide's Place in the Right Formulation
Why Isn't an Isolated Active Enough?
Copper peptide's effectiveness depends heavily on formulation decisions. GHK-Cu maintains its most stable structure at pH 6-7; outside this range, the copper ion can be released, leading to oxidative damage. At acidic pH (vitamin C serums, AHA/BHA acid exfoliants), the GHK-Cu complex breaks down and loses effectiveness. That's why pH control of the formulation environment matters just as much — if not more — than the active concentration itself. A product's label listing "copper peptide" doesn't mean that product's formulation environment actually preserves GHK-Cu stability.
The CIRÈLL Biomimetic TriBarrier System and Copper Peptide's Place in It
CIRÈLL's Biomimetic TriBarrier System is instead built on three real lipids that mimic the stratum corneum's own composition: Ceramide, Cholesterol, and Phytosphingosine, supported by Madecassoside and Panthenol. The comparison information below is a general reference for those evaluating copper-peptide-containing products separately.
Synergistic Active Combinations
CIRÈLL does not sell a copper-peptide-containing formulation; the compatibility notes below are general reference information about GHK-Cu itself. Madecassoside (Centella asiatica extract) strengthens GHK-Cu's collagen synthesis by activating the TGF-β1 pathway while reinforcing the anti-inflammatory effect. Panthenol and hyaluronic acid maintain dermal hydration, keeping fibroblasts working in an optimal environment. This combination delivers far more comprehensive, lasting barrier support than any single active could provide on its own, while also creating a biomimetic synergy where each active reinforces the others.
Combining Copper Peptide With Other Actives, and a Usage Strategy
Which Actives Is It Compatible With?
Fully compatible with GHK-Cu. Keeping the environment moist increases copper peptide absorption; pH balance is maintained and synergistic moisture retention is achieved.
A safe combination in the pH 5-7 range. Niacinamide's support for ceramide synthesis complements GHK-Cu's barrier effect; using them together is clinically validated.
Synergistic collagen support is achieved with palmitoyl tripeptide-1 and palmitoyl pentapeptide-4. Since their mechanisms differ, they complement rather than suppress each other.
Combining with lipid barrier supporters reinforces copper peptide's ceramide-synthesis effect. This is the most effective core combination for comprehensive barrier repair.
Which Actives Should It Be Kept Separate From?
Copper peptide shouldn't be applied at the same time as acidic formulations. Low-pH actives like L-ascorbic acid (vitamin C), AHA and BHA acids, and retinoic acid can break down the GHK-Cu complex, and the released Cu²⁺ ion can lead to oxidative damage. That's why a separation strategy — vitamin C in the morning routine, copper peptide in the evening routine — or different layering between them is recommended. People using retinol should wait at least 20 minutes between retinol and copper peptide instead of applying them in the same step, or assign them to different nights; this separation preserves both effectiveness and tolerability.
A Step-by-Step Copper Peptide Application Routine
Cleansing: Use a gentle, pH-balanced (5.5-6) cleanser. Detergent residue disrupts skin surface pH, negatively affecting GHK-Cu absorption.
Toner / Essence: Apply a hyaluronic acid-based, pH-neutral toner. Keeping skin lightly damp makes it easier for GHK-Cu to penetrate into the epidermis.
Copper Peptide Serum: Apply 3-4 drops to lightly damp skin, pressing in gently. The effective concentration range is 0.05-1%; above 2% can lead to long-term tolerance issues.
Barrier Cream / Moisturizer: Lock it in with an occlusive layer containing ceramide and cholesterol. This layer keeps GHK-Cu in the skin's upper layers, extending its window of effect.
Sunscreen (morning routine only): While copper peptide supports sun-damage repair, it doesn't replace active UV protection. Daily broad-spectrum SPF 30+ is mandatory.
What Do These Signs on Your Skin Mean?
If you're experiencing one or more of the following signs, it may point to barrier weakening linked to a copper peptide deficiency and a need for GHK-Cu support.
Fine wrinkles linked to reduced collagen and elastin production become particularly noticeable around the eye area, forehead, and cheekbones. Declining fibroblast activity and unchecked MMPs accelerate this process; GHK-Cu can correct both mechanisms at once.
This sign, which indicates disrupted ceramide synthesis and TEWL control, points to insufficient lamellar lipid integrity — the very thing copper peptide supports. If tightness doesn't ease even after applying moisturizer, a barrier-level problem should be suspected.
Chronic NF-κB activation sensitizes skin to environmental triggers. GHK-Cu's TNF-α- and IL-1β-suppressing effect can break this inflammatory loop; it plays a particularly soothing role in rosacea-prone skin.
This shows up as a result of a slowed renewal cycle, reduced microvascular activity, and a buildup of old cells on the surface. GHK-Cu's angiogenic effect can revive skin's microcirculation, reversing lost radiance.
Conclusion
Copper peptide (GHK-Cu) is a highly multi-targeted active with proven effectiveness in both anti-aging and barrier-repair contexts, backed by decades of clinical research. It functions through several mechanisms at once: fibroblast activation and collagen synthesis, ceramide-production support, strengthened antioxidant defense, and an anti-inflammatory effect. This integrated profile positions it not merely as a "wrinkle active," but as a comprehensive barrier renewer. For successful results, the formulation environment (pH 6-7), combination compatibility, and consistent use duration (a minimum of 8-12 weeks) are critically important.
"Copper peptide is not part of CIRÈLL's current formula. If you're adding it to your own routine, we recommend consulting a dermatologist or pharmacist first. We recommend consulting a dermatologist or pharmacist before making room for copper peptide in your own skincare routine."
Frequently Asked Questions
What are copper peptides?
Copper peptide, best known in the form of GHK-Cu (glycine-histidine-lysine-copper complex), is a tripeptide-copper complex found naturally in human plasma that triggers skin renewal, collagen synthesis, and barrier repair.
What exactly is copper peptide (GHK-Cu)?
Copper peptide is a small tripeptide made of the amino acid trio glycine-histidine-lysine that forms a chelate complex with a Cu²⁺ copper ion. It's produced naturally in human plasma, saliva, and urine; its molecular weight is roughly 340 Da. When used in skincare, it regulates several biological pathways at once — fibroblast activation, collagen synthesis, ceramide production, and antioxidant defense. The terms "copper peptide" and "GHK-Cu" are used interchangeably in a cosmetic context.
Through which mechanism does copper peptide repair the skin barrier?
Copper peptide (GHK-Cu) repairs the skin barrier through several parallel mechanisms: (1) it activates the serine palmitoyltransferase enzyme, increasing ceramide synthesis in the stratum corneum; (2) it strengthens the expression of tight junction proteins like claudin-1, claudin-4, and occludin; (3) it activates dermal fibroblasts, increasing type I and III collagen production while suppressing MMP-1 and MMP-2 activity; (4) it increases superoxide dismutase (SOD) activity, reducing oxidative damage. Together, these four mechanisms renew barrier integrity at both the epidermal and dermal level.
At what concentration should copper peptide appear in products?
The GHK-Cu concentration found effective in clinical studies is between 0.05% and 1%. Below this range, biological effect remains insufficient, while above 2%, there's a risk of a paradoxical effect and possible irritation. Starting at a 0.05-0.2% concentration and gradually increasing to the 0.5-1% range once skin has adjusted to GHK-Cu is recommended. If a product's label doesn't clearly state the active concentration, checking whether GHK-Cu appears among the first 5% of the ingredient list can be a reliable guide.
Can I use copper peptide at the same time as vitamin C?
Copper peptide and vitamin C (particularly L-ascorbic acid) shouldn't be used simultaneously. L-ascorbic acid is most effective at pH 2.5-3.5; this acidic environment breaks down the GHK-Cu complex, releasing free Cu²⁺ ions. Rather than reducing oxidative damage, this free copper ion can actually accelerate the oxidation of L-ascorbic acid. The recommended strategy: separate them in time — morning vitamin C serum + sunscreen, evening copper peptide serum + barrier cream. Alternatively, pH-neutral vitamin C derivatives like magnesium ascorbyl phosphate offer a more compatible combination with copper peptide.
Is it safe to use copper peptide together with retinol?
Copper peptide and retinol can be used together, but applying them in the same step at the same time isn't recommended. While retinol isn't an active that requires low pH, some retinol formulations' acidic pH range can negatively affect GHK-Cu stability. The recommended method: add copper peptide serum 20-30 minutes after applying retinol, or assign them to different nights of the week. Copper peptide's fibroblast-activation and collagen-synthesis support can work synergistically with retinol's cell-renewal effect; with the right timing, this combination is powerful for anti-aging effect.
Is copper peptide suitable for sensitive and reactive skin?
Yes, copper peptide is generally well tolerated for sensitive and reactive skin, and is even a particularly suitable active. GHK-Cu's NF-κB-suppressing and TNF-α-reducing properties ease chronic low-grade inflammation; this mechanism directly targets the triggering factor that increases reactivity. While actives like retinol, AHA, or high-concentration vitamin C can cause irritation in sensitive skin, copper peptide offers similar anti-aging and barrier support with a far lower risk profile in these skin types. That said, other ingredients in the formulation (fragrance, alcohol, high-concentration essence) can be a source of irritation, so the full ingredient list should be evaluated when choosing a product.
Can oily and acne-prone skin use copper peptide?
Yes, oily and acne-prone skin can use copper peptide. GHK-Cu isn't comedogenic and carries no pore-blocking risk. On the contrary, the copper ion's mild antimicrobial property may offer supportive effect against the acne bacterium P. acnes. Copper peptide's anti-inflammatory capacity can also help reduce the severity of inflammatory acne lesions. Lightweight, water-based copper peptide serum formulations should be preferred for oily skin; heavy emollients or highly occlusive creams should be avoided.
At what age should you start using copper peptide?
While there's no strict minimum age for using copper peptide, the most noticeable benefit is known to appear at age 25 and above. Starting at age 25, endogenous GHK-Cu levels and collagen synthesis begin gradually declining, which is why preventive use from this age onward makes sense. For the 30-40 age group, it's a strong option for restorative anti-aging goals. Above age 50, copper peptide's capacity to activate collagen synthesis becomes particularly valuable, though this age group may need higher concentrations and multi-active combinations. Use isn't recommended under age 18 without a medical indication.
Does copper peptide use differ between winter and summer?
Copper peptide can be used year-round, but seasonal conditions affect the application strategy. In winter, the dry indoor environment caused by low humidity and heating raises TEWL; during this period, copper peptide's ceramide-synthesis support and moisture-protection effect become more critical, and a more intensive barrier-cream combination is recommended. In summer, UV exposure increases; copper peptide's SOD activation offers additional protection against UV-induced oxidative damage. Since SPF takes priority in a summer routine, copper peptide should stay in the evening routine, while sunscreen must always be added as the final step in the morning.
Are expensive copper peptide products more effective?
There's no direct correlation between price and effectiveness. The main factors that determine copper peptide's effectiveness are: the GHK-Cu concentration in the formulation (the 0.05-1% range), pH stability (6-7), the delivery system's quality (liposomal or nanoemulsion systems increase penetration), and storage conditions (copper compounds are sensitive to light and heat). These parameters are more likely to be optimized in expensive products, but it's also possible to find formulations with an adequate GHK-Cu concentration and suitable pH in the mid-price segment. A transparent ingredient list and formulation data shared by the manufacturer should be the deciding factor in product choice, not price.
What are copper peptide's known side effects?
Copper peptide is considered an extremely well-tolerated active in clinical studies. Rare side effects include: temporary redness or a burning sensation at very high concentrations (2%+); allergic contact dermatitis to copper compounds (extremely rare); and oxidative irritation from free copper ions due to an incorrect combination (an acidic environment). In products with a correct formulation and concentration within the recommended range, there's no systemic side-effect risk with topical use. For people who haven't had a skin test with copper compounds, a 48-hour patch test on the inner forearm is recommended before starting a new product.
Which symptoms while using copper peptide should prompt a doctor visit?
You should see a dermatologist if the following symptoms develop while using copper peptide: redness, swelling, or a burning sensation lasting more than 48 hours; vesicles (blisters) or crust formation; an allergic reaction spreading beyond the application area; or persistent irritation that doesn't clear up after stopping the product. Beyond this, planning topical actives under a dermatologist's supervision — depending on what skin issue you're using copper peptide for, such as clinically advanced photodamage, active inflammatory acne, rosacea, or atopic dermatitis — improves the predictability of results and minimizes risk.
At what point in a skincare routine should copper peptide be applied?
Copper peptide is applied after cleanser and toner, before moisturizer and sunscreen — that is, at the serum stage. Standard order: (1) Cleanser → (2) Toner/essence → (3) Copper peptide serum → (4) Barrier cream/moisturizer → (5) Sunscreen (morning only). Applying it to lightly damp skin increases penetration; the moisturizer that follows both locks in moisture and helps GHK-Cu stay in the skin. If you use retinol or niacinamide in your evening routine, these actives can be placed before or after the copper peptide serum; but acidic actives (AHA/BHA, vitamin C) should be moved to a different routine/time.
Does copper peptide genuinely reduce TEWL (transepidermal water loss)?
Yes, copper peptide reduces TEWL to a clinically measurable degree. In placebo-controlled research, serums containing 0.5% GHK-Cu reduced TEWL values by an average of 22% (compared to 4% in the placebo group) after 8 weeks of daily use, measured with a Tewameter. This effect stems from two mechanisms: first, copper peptide activates ceramide-synthesis enzymes, strengthening the lamellar lipid layer; second, it increases expression of the tight junction proteins claudin-1 and occludin, reducing water permeability. The drop in TEWL runs parallel with reduced dryness, tightness, and environmental reactivity, making copper peptide a valuable component of barrier-repair-focused routines.
Copper peptide or synthetic matrixyl peptides — which is more effective?
These two peptide categories complement each other rather than compete directly. GHK-Cu (copper peptide) functions as a "biological signaling molecule" through signaling-pathway modulation and gene-expression regulation; it triggers numerous cellular mechanisms simultaneously and is particularly strong for fibroblast activation and reducing TEWL. Matrixyl peptides like palmitoyl tripeptide-1 or palmitoyl pentapeptide-4 more specifically activate the TGF-β pathway, supporting collagen-specific synthesis. In terms of clinical evidence density, GHK-Cu's independent research base is far broader. When used together, they deliver synergistic anti-aging and barrier support through different mechanisms.
How long does it take for copper peptide to show visible effects?
Copper peptide's effects unfold across a few different timeframes. First 2-4 weeks: quicker barrier results can be observed, such as increased plumpness and moisture, and the easing of tightness linked to reduced TEWL. 8-12 weeks: reduced wrinkle depth and increased skin elasticity have been documented in clinical studies by this point. 6 months and beyond: increased collagen density at the biopsy level; this result shows that collagen's biological production and maturation process takes time. Consistent daily use, the right formulation, and a suitable combination are the main factors affecting these timelines. Copper peptide isn't a fast-result active — it's a long-term investment.
Can copper peptide and niacinamide be used together?
Yes, copper peptide and niacinamide (vitamin B3) can be safely used together; this combination is actually one of the synergistic pairs recommended in clinical practice. Niacinamide is stable in the pH 5-7 range, which overlaps with the range where copper peptide is also most stable. Niacinamide's support for ceramide synthesis and free-fatty-acid production reinforces copper peptide's mechanism in the same direction. Niacinamide's sebum-regulating and pore-appearance-reducing properties combine with copper peptide's anti-aging profile to create a comprehensive barrier-care equation. They can be applied in the same serum step or one after another; no inactivation or irritation risk has been reported.
Can copper peptide be used during pregnancy or breastfeeding?
Broad pregnancy safety data isn't available for topical copper peptide use. While GHK-Cu is a compound naturally produced in the human body, its systemic absorption level with topical application and its potential effects on a developing fetus haven't been sufficiently researched. Because of this uncertainty, consulting a dermatologist or obstetrician before deciding on copper peptide use during pregnancy and breastfeeding is recommended. During this period, alternatives with a better-documented general safety profile — like panthenol, hyaluronic acid, and azelaic acid — can be preferred.
Scientific Sources
- Pickart L, Vasquez-Soltero JM, Margolina A. GHK Peptide as a Natural Modulator of Multiple Cellular Pathways in Skin Regeneration. Biomed Res Int. 2015;2015:648108.
- Pickart L, Vasquez-Soltero JM, Margolina A. The human tripeptide GHK-Cu in prevention of oxidative stress and degenerative conditions of aging: implications for cognitive health. Oxid Med Cell Longev. 2012;2012:324832.
- Lintner K, Peschard O. Biologically active peptides: from a laboratory bench curiosity to a functional skin care product. Int J Cosmet Sci. 2000;22(3):207-18.
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