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.
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.