Also known as Palmitoyl Pentapeptide-4 · Pal-KTTKS · Matrixyl
Palmitoylated matrikine peptide that signals fibroblasts to synthesize collagen — contains no copper.
Matrixyl is palmitoyl pentapeptide-4 (Pal-KTTKS), a lipidated peptide whose KTTKS core is a fragment of type-I procollagen. Rather than delivering copper, it acts as a matrikine signal that stimulates extracellular-matrix synthesis.
Matrixyl is the trade name for palmitoyl pentapeptide-4, a five-amino-acid sequence (KTTKS) joined to a palmitic-acid chain that improves skin penetration. The KTTKS sequence is a fragment naturally cleaved from the C-terminal propeptide of type-I procollagen during collagen assembly.
The body uses that fragment as a feedback signal — a "matrikine" — telling fibroblasts to keep producing matrix. Matrixyl exploits this: it is studied not as a copper peptide but as a signaling molecule that drives collagen synthesis, and it is one of the better-evidenced cosmetic peptide ingredients.
Matrikine signaling — mimics a procollagen-I fragment to upregulate collagen and fibronectin synthesis.
Behind every vial of Matrixyl (Palmitoyl Pentapeptide-4) is the same exacting pipeline every research peptide runs — but the chemistry plays out differently for this molecule. Here is how Matrixyl (Palmitoyl Pentapeptide-4), specifically, is brought into being.
On paper, Matrixyl (Palmitoyl Pentapeptide-4) weighs in at roughly 802 daltons. Before a single bond is made, the target sequence, salt form, and purity threshold are written down as the contract the finished material must meet.
Assembling Matrixyl (Palmitoyl Pentapeptide-4) means roughly 5 coupling cycles on the synthesizer — one protected residue added at a time, which is also 5 chances for an incomplete coupling to seed a deletion impurity. It is a short sequence, which makes the build comparatively tractable — but short does not mean trivial, and purity is still won or lost downstream. It also carries fatty-acid acylation, an extra step beyond a plain chain that adds both capability and cost.
The crude mixture — Matrixyl (Palmitoyl Pentapeptide-4) plus its deletions and side products — is then separated on preparative HPLC, and where the cut is taken decides the difference between a genuinely pure peptide and a barely-passable one.
A real batch of Matrixyl (Palmitoyl Pentapeptide-4) proves itself: identity confirmed by mass spectrometry against its ~802 Da, purity read directly off an analytical HPLC trace, water and counterion content measured. That batch-specific certificate of analysis is the only honest way to know what is actually in a vial of Matrixyl (Palmitoyl Pentapeptide-4) — and a short, cold, accountable chain of custody is how that purity survives the trip to your bench.
Producing Matrixyl (Palmitoyl Pentapeptide-4) to a genuine purity spec means solid-phase synthesis, preparative HPLC purification, and batch quality control — none of it cheap, and none of it something you can verify by eye.
Don't judge a vial by its cake. A fluffy, good-looking lyophilized powder reflects bulking agents and freeze-drying parameters — not purity. Insist on a batch-specific certificate of analysis.
Recent clinical trials and publications mentioning Matrixyl, pulled automatically from ClinicalTrials.gov and PubMed and refreshed daily. Listings are unfiltered search results, not curated endorsements.
Matrixyl is palmitoyl pentapeptide-4 (Pal-KTTKS), a lipidated peptide whose KTTKS core is a procollagen-I fragment that signals fibroblasts to produce collagen. It is a widely used cosmetic ingredient.
No. Unlike GHK-Cu and AHK-Cu, Matrixyl contains no copper. It works as a matrikine signal, not by delivering a metal.
A 12-week split-face randomized controlled trial (Robinson et al., 2005) reported improvements in wrinkle depth and skin roughness, making it one of the better-evidenced cosmetic peptides.
Its KTTKS sequence mimics a collagen-breakdown fragment, signaling fibroblasts to upregulate collagen I, collagen IV, and fibronectin synthesis.
Dosing protocols, mechanism, comparisons, and the latest trials — citation-backed answers grounded in PubMed, PubChem, and ClinicalTrials.gov.