Matrixyl

Last Updated: August 2026

Matrixyl is the trade name for palmitoyl pentapeptide-4 (INCI; called palmitoyl pentapeptide-3 before 2006), a topical cosmetic peptide launched by Sederma in 2000. Its sequence is Pal-Lys-Thr-Thr-Lys-Ser (Pal-KTTKS) — a five-amino-acid subfragment of collagen I attached to a 16-carbon palmitoyl chain that helps it penetrate the skin's lipid barrier. It is a matrikine: a matrix-derived peptide that signals skin cells to rebuild. It is a cosmetic ingredient, not an approved drug.

What is Matrixyl and how does it work?

Pal-KTTKS is a fragment of type I collagen; when fibroblasts encounter it, they respond as if collagen has broken down and increase production of collagen (types I and III), fibronectin, and other matrix components — signaling repair rather than forcing it, which is why the effect is gentle and gradual. The palmitoyl chain is essential: without it the peptide can't cross the stratum corneum effectively.

What does the evidence show — and why is Matrixyl notable?

Matrixyl is the best-studied cosmetic peptide and, unlike many, has independent clinical support: a 12-week double-blind, split-face randomized trial (Robinson et al., 2005) in ~93 women found that a few parts per million of Pal-KTTKS versus vehicle significantly reduced fine lines and wrinkles1 source and fine lines versus vehicle, and a separate double-blind trial comparing it against acetyl hexapeptide-3 for crow's feet found the palmitoyl pentapeptide edged out the hexapeptide. It's a credible supporting active — gentle and gradual, not retinoid-strength. Evidence level: Independent double-blind RCTs (best-in-class for cosmetic peptides); effect modest.

Is Matrixyl safe, and how does it pair with other actives?

Matrixyl is very well tolerated — non-irritating, it doesn't increase sun sensitivity, and it has no retinoid-style adjustment period — making it one of the easier anti-aging actives for reactive skin, and it layers comfortably with retinol and most other ingredients. As with all topical peptides, keep expectations realistic about the size of the effect. Matrixyl sits in Peptigrity's skin and anti-aging peptides category.

Why does raw-material verification matter, and how does Peptigrity verify?

Matrixyl is sold as a raw peptide and in countless finished products, and identity/purity of the raw material vary — HPLC purity and mass-spec identity (expected MW ~802 Da1 source) confirm the correct Pal-KTTKS at the labeled amount. Peptigrity collects independent third-party Certificates of Analysis for Matrixyl from shops' official channels and verifies each for authenticity before publishing. Because shops choose which COAs to publish, results reflect the batches shops have made public rather than every production batch — a selection bias we state openly. A community-funded Testing Grant to purchase and test vials anonymously is in development. Tests in the database come from independent labs such as Janoshik Analytical, Freedom Diagnostics, and Chromate. The trust score weights lab purity and reviews equally (50/50). See how to read lab results. Compare bulk-ingredient vendors against the independent Matrixyl lab tests on file.

This section is for educational and informational purposes only and does not constitute medical advice. Matrixyl is not approved by the FDA or equivalent regulators as a drug; it is sold as a cosmetic ingredient and as a research compound. Always consult a qualified healthcare provider before using any peptide or research compound. Peptigrity is an independent review platform and does not sell, endorse, or recommend specific products or vendors.