Matrixyl (palmitoyl pentapeptide-4, Pal-KTTKS) is a lipopeptide used in anti-aging skincare. It consists of the pentapeptide KTTKS (a fragment of type I procollagen) conjugated to a palmitic acid chain to enhance skin penetration. Developed and patented by Sederma, it was one of the first cosmetic peptides to gain widespread commercial use. In vitro studies show it stimulates collagen I, III, and fibronectin synthesis in fibroblasts. A small number of clinical studies suggest modest anti-wrinkle effects, but independent clinical data is limited and effect sizes are substantially smaller than those seen with retinoids.
Category: Cosmetic Peptide. Evidence rating: F (anecdotal/unsupported).
Clinical status: Cosmetic ingredient. No pharmaceutical regulatory approval. Limited clinical studies.
The KTTKS sequence is a fragment of the C-terminal propeptide of type I procollagen. When collagen is synthesized, this propeptide is cleaved off, and the KTTKS fragment feeds back to fibroblasts as a signal to produce more collagen (a positive feedback mechanism). The palmitoyl chain enhances…
Safety considerations: Generally well tolerated in cosmetic formulations; No significant adverse effects reported in published studies; Low irritation potential compared to retinoids.
Reviewed by the PeptideAtlas Editorial Team. Last reviewed: 2026-07-06.
Related peptides: Matrixyl 3000, Snap-8, Palmitoyl Tripeptide-1.
Compare: Matrixyl vs Matrixyl 3000, Matrixyl vs Snap-8, Matrixyl vs Palmitoyl Tripeptide-1.
No. While Matrixyl has some clinical evidence for wrinkle reduction, the evidence base for retinoids (tretinoin, retinol) is vastly larger and more robust. Retinoids remain the gold standard for topical anti-aging. Matrixyl may be useful for individuals who cannot tolerate retinoids.
Matrixyl is palmitoyl pentapeptide-4 (Pal-KTTKS), a single peptide. Matrixyl 3000 is a combination of two different peptides: palmitoyl tripeptide-1 and palmitoyl tetrapeptide-7. They are different products from the same manufacturer (Sederma) with different mechanisms.
Sederma recommends using Matrixyl at specific concentrations for efficacy, but many consumer products do not disclose their percentage. The Robinson et al. clinical study used a formulation at the manufacturer-recommended level. Products listing Matrixyl low in the ingredient list likely contain sub-effective concentrations. Look for products that specify the percentage or list Matrixyl among…
Yes. Matrixyl and retinol work through different mechanisms — Matrixyl signals fibroblasts to produce collagen via the KTTKS fragment, while retinoids regulate gene expression through nuclear retinoic acid receptors. They can be used in the same skincare routine. Some formulators combine them in a single product. Matrixyl is much less irritating than retinoids, making it a useful complement for…