Comparison tool
Matrixyl vs GHK-Cu side-by-side
Stack up to four peptides by evidence status, mechanisms, study dosing, side effects, and references.
Comparison tool
Stack up to four peptides by evidence status, mechanisms, study dosing, side effects, and references.
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| Property | Matrixyl | GHK-Cu |
|---|---|---|
| Category | Skin & Hair | Skin & Hair |
| Also known as | Palmitoyl Pentapeptide-4, Pal-KTTKS | Copper Peptide, Glycyl-L-histidyl-L-lysine copper |
| FDA approved | No | No |
| Clinical status | Cosmetic use; extensively studied
| Used in cosmetic products with limited human topical-skincare evidence; the source also notes injectable compounding restrictions and a pending reclassification process.
|
| What to expect | Collagen production, anti-aging, skin firmness | Skin rejuvenation, wound healing, hair growth, anti-aging |
| How it works | Matrixyl is described as Pal-KTTKS, a palmitoylated form of a five-amino-acid collagen fragment. The KTTKS segment is presented as a matrikine-style signal associated with extracellular-matrix turnover, while the palmitoyl tail is used to improve compatibility with topical delivery through the outer skin barrier. The supplied evidence distinguishes this collagen-signaling model from muscle-targeting wrinkle approaches. | GHK-Cu is described as the copper(II) complex of the GHK tripeptide. The source connects its activity to copper binding and possible cellular copper delivery, but also emphasizes effects that go beyond a simple carrier model. Reported laboratory observations include shifts in gene expression, increased fibroblast production of extracellular-matrix components, keratinocyte support, vascular-related activity, and antioxidant or anti-inflammatory signals. The precise mechanism is still not fully defined. |
| Typical dosing | Limited community data available · See research protocols · Topical (serums, creams) | 1-2 mg daily injection or 0.05% topical · Once daily · Subcutaneous injection or topical application |
| Research dosing | 3-8% in formulations · 8-12 weeks for visible results, ongoing use · Topical (serums, creams) | 1-2 mg for injectable protocols · Varies by application · Subcutaneous injection or topical application |
| Typical duration | 8-12 weeks for visible results; ongoing use reported | Varies by application |
| Administration | Topical skin application in serums or creams | Subcutaneous injection or topical application |
| Timing | Morning or as directed With or without food | Evening for skin or recovery contexts With or without food |
| Evidence level | Research | Clinical Trials |
| Possible side effects |
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| Research summary | The source highlights a 12-week double-blind, placebo-controlled split-face study in 93 women aged 35 to 55 that compared a Pal-KTTKS moisturizer with the same base moisturizer. It reports improvements in fine lines and wrinkles on the peptide-treated side with good tolerability. Laboratory evidence cited in the source points toward increased collagen I, collagen IV, and fibronectin synthesis. The source also cautions that large percentage claims often trace back to manufacturer or formulation data, so exact promotional figures should not be treated as settled clinical outcomes. | The source describes a mixed evidence base. Cell and animal work is reported for wound repair, collagen deposition, fibroblast activity, elastin and growth-factor production, keratinocyte protection, and lung-injury models. Human data are described as small topical cosmetic studies, including facial-cream and eye-cream studies with 71 and 41 participants that reported changes in skin density, thickness, and wrinkle appearance. These data are encouraging for topical skin endpoints but do not establish injected or systemic benefits. |
| References | ||
| Full profile | View Details | View Details |
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Track your peptide journeyEducational use only. This information is aggregated from public research and community reports. It is not medical advice, and dosing details are descriptive, not recommendations. Always consult a qualified healthcare professional.