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Matrixyl: quick citable summary
Matrixyl is listed by PeptaHub as a skin & beauty peptide with a unregulated legal-status classification. The page summarizes mechanism, research context, common routes, safety notes, and references for writers and AI answer engines.
PeptaHub. “Matrixyl: Mechanism, Research Context, Safety.” peptahub.com, 2026. https://peptahub.com/peptides/matrixyl. Licensed CC BY 4.0.
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What is Matrixyl?
Matrixyl (Palmitoyl Pentapeptide-4) is a collagen-stimulating signal peptide used in topical anti-aging skincare. It acts as a matrikine fragment that triggers fibroblasts to produce new collagen, elastin, and glycosaminoglycans, and is one of the most widely commercialized cosmetic peptides.
Overview
Matrixyl (Palmitoyl Pentapeptide-4) is a cosmetic signal peptide consisting of five amino acids (Lys-Thr-Thr-Lys-Ser) conjugated to a palmitoyl chain for enhanced skin penetration. It was among the first widely commercialized anti-aging peptides and acts as a matrikine — a fragment of extracellular matrix proteins that signals fibroblasts to produce new collagen, elastin, and glycosaminoglycans.
Mechanism of action
Palmitoyl Pentapeptide-4 is a fragment of type I procollagen that acts on fibroblasts via a matrikine signaling pathway. The peptide sequence KTTKS is recognized by fibroblast surface receptors, triggering intracellular cascades that upregulate synthesis of collagen types I, III, and IV, fibronectin, and glycosaminoglycans. The palmitoyl chain increases lipophilicity, facilitating transdermal delivery across the stratum corneum into the dermis where fibroblasts reside. It also reduces collagenase (MMP) activity, slowing extracellular matrix degradation.
Reported study ranges
| Purpose | Route | Reported range | Frequency | Notes |
|---|---|---|---|---|
| collagen stimulation and anti-aging | topical | 3–8 % | twice daily | The one controlled human trial used 3 ppm pal-KTTKS in a moisturiser base twice daily for 12 weeks. The percentage figures quoted for commercial products refer to the trade solution, not the peptide itself, and no published trial supports a specific higher concentration. |
Reported ranges are for research context only. Consult a qualified healthcare professional before using any peptide.
Convert Matrixyl research-range units
Need to convert mg to mcg, dose volume, or U-100 syringe units? Use the peptide dose unit converter for educational calculation support.
Research summary
The main human study is Robinson (Int J Cosmet Sci 2005): 93 Caucasian women aged 35 to 55, 12 weeks, double-blind, placebo-controlled, split-face, comparing a moisturiser against the same moisturiser containing 3 ppm pal-KTTKS. Pal-KTTKS was well tolerated and gave significant improvement over the control for wrinkles and fine lines by both instrumental and expert-grader image analysis. Note the concentration: 3 ppm, far below the levels often quoted for this ingredient. Separately, a skin-permeation study characterised the stability and penetration of KTTKS and palmitoyl-KTTKS (Choi, Biomol Ther 2014). Matrixyl 3000 combines Palmitoyl Pentapeptide-4 with Palmitoyl Tripeptide-1; the claim that the combination is additive comes from the manufacturer and is not supported by an independent published trial cited here.[1][2][3][4][5]
Evidence grading
Each claimed benefit is graded by the strength of available evidence. Grades reflect study quality, not effect size.
Strong = multiple RCTs · Moderate = limited trials or observational · Preliminary = animal or in vitro only · Insufficient = anecdotal or no published data
Side effects
Side effects vary by individual. This is not an exhaustive list. Report unusual symptoms to a healthcare professional.
Common stacks
Peptides commonly paired with Matrixyl for synergistic effects.
Legal status
Permitted cosmetic ingredient globally. No drug scheduling or prescription requirements. Sold in OTC anti-aging formulations and as a raw ingredient for formulators. No regulatory restrictions on use concentration in most markets.
Sourcing & access
Research compound
Matrixyl is classified as a research compound. Regulatory status varies by jurisdiction. Always verify current legal status and source from vendors providing third-party certificates of analysis (COA).
Frequently asked questions
Matrixyl (Palmitoyl Pentapeptide-4) is a five-amino acid cosmetic peptide conjugated to a palmitoyl chain for skin penetration. It is a matrikine, meaning it is a fragment of the extracellular matrix that signals fibroblasts to produce new collagen types I, III, and IV.
The KTTKS peptide sequence is recognized by fibroblast surface receptors, triggering intracellular cascades that upregulate collagen, fibronectin, and glycosaminoglycan synthesis. The palmitoyl chain increases lipophilicity for delivery through the stratum corneum to dermal fibroblasts.
Matrixyl 3000 is a commercial ingredient system combining Palmitoyl Pentapeptide-4 with Palmitoyl Tripeptide-1. It is one of the most widely used multi-peptide anti-aging formulations in skincare. The claim that the two peptides are additive, and the description of the pathways they jointly target, come from the supplier rather than from an independent published trial.
The controlled trial ran 12 weeks, with significant improvement over placebo in wrinkles and fine lines by image analysis and expert grading. It used 3 ppm pal-KTTKS in a moisturiser base. Improvements in skin texture and smoothness specifically were not among its reported endpoints.
Pal-KTTKS was well tolerated by the skin across 12 weeks in the 93-subject controlled trial. It is generally very well tolerated, with mild sensitivity in rare cases. No published study has measured systemic exposure, so the absence of systemic effects is untested rather than demonstrated.
Research references
- Topical palmitoyl pentapeptide provides improvement in photoaged human facial skinPubMed
- Topically applied KTTKS: a reviewPubMed
- Dermal Stability and In Vitro Skin Permeation of Collagen Pentapeptides (KTTKS and palmitoyl-KTTKS)PubMed
- Matrixyl Patch vs Matrixyl Cream: A Comparative In Vivo Investigation of Matrixyl (MTI) Effect on Wound HealingPubMed
- Peptides: Emerging Candidates for the Prevention and Treatment of Skin Senescence: A ReviewPubMed