INCI: Palmitoyl Pentapeptide-4 - Also known as: Matrixyl, Pal-KTTKS, Palmitoyl Lysyl-Threonyl-Threonyl-Lysyl-Serine

QUICK FACTS

What is Matrixyl® (Palmitoyl Pentapeptide-4)?

Palmitoyl Pentapeptide-4, trademarked as Matrixyl by Sederma, is among the most extensively studied signal peptides in cosmetic science. It is a synthetic pentapeptide - a five-amino-acid sequence (Lys-Thr-Thr-Lys-Ser, or KTTKS) - derived from the sequence of pro-collagen I, the precursor to type I collagen. The KTTKS sequence is a fragment that occurs naturally when collagen is broken down in the skin; its presence is studied in connection with signaling fibroblasts to initiate new collagen and elastin production as part of the skin's repair response. In other words, it mimics a naturally occurring signal associated with dermal matrix renewal.

The palmitoyl group attached to the peptide chain is a fatty acid modification that improves the peptide's ability to penetrate the stratum corneum - without it, the hydrophilic peptide would remain at the skin's surface without reaching the viable epidermis where fibroblasts reside. This lipophilic modification is the technical innovation that allowed peptide skincare to move from theoretical to practically functional.

Palmitoyl Pentapeptide-4 is one of five industry peptides included in the Sweet Chemistry formulas alongside Matrikynes® bone peptides. While Matrikynes® provides the broad-spectrum ECM-derived signaling of 315+ matrikine peptides, the industry peptides - including Matrixyl - add targeted, well-researched individual sequences that have accumulated their own independent bodies of clinical literature. Together they form a comprehensive peptide system that no single peptide technology could replicate.

What does it do for skin?

Palmitoyl Pentapeptide-4 is studied in connection with fibroblast activity in the dermis - specifically, its association with signaling cells to support the production of collagen I, collagen III, fibronectin, and hyaluronic acid. The research basis for these associations is substantial by cosmetic peptide standards: Matrixyl has been independently studied in multiple peer-reviewed and industry publications since Sederma's original research in the early 2000s, accumulating a body of evidence that few single synthetic peptides can match.

Published study data on Palmitoyl Pentapeptide-4 has been associated with visible improvements in the appearance of fine lines and wrinkles, skin density, and surface smoothness over consistent use - with outcomes in some studies comparable to retinol's effects on wrinkle depth reduction, without retinol's associated sensitivity or irritation profile. These are association-based cosmetic outcome observations rather than drug mechanism claims, and individual results will always vary. But the published literature on this peptide is more robust than for most single synthetic sequences in the skincare market.

Within Sweet Chemistry's industry peptide complex, Palmitoyl Pentapeptide-4 works alongside Palmitoyl Hexapeptide-52, Palmitoyl Tetrapeptide-50, Heptapeptide-15, and Palmitoyl Heptapeptide-18 - each targeting a different aspect of the ECM renewal and skin density environment. All five operate at greater than 1% combined concentration, formulated within the brand's patent-pending emulsion system that allows this level of active peptide loading without exceeding what traditional formulations could accommodate.

Notable Published Research (Palmitoyl Pentapeptide-4)

These are research associations, not clinical claims. Individual results may vary.

FOUND IN

In 3 Formulas as Part of the 5% Industry Peptide Complex

Palmitoyl Pentapeptide-4 is formulated within the five-peptide industry complex at a combined 5% in all three water-based Sweet Chemistry formulas - each product in the system that contains both Matrikynes® bone peptides and the industry peptide panel.

Nourishment - All Skin Types

Barrier Repairing Hydra-Serum 5% Industry Peptide Complex (incl. Palmitoyl Pentapeptide-4) - 1.0 oz / 30 ml

The Hydra-Serum delivers the five-peptide industry complex alongside 3% Matrikynes® bone peptides in a 40%-active emulsion - the most comprehensive peptide delivery in a serum format in the Sweet Chemistry lineup.

Hydration - Dry to Normal

Elasticity Reinforcing Hydra-Cream 5% Industry Peptide Complex (incl. Palmitoyl Pentapeptide-4) - 1.7 oz / 50 ml

The Hydra-Cream pairs the five-peptide complex with 3% Matrikynes® peptides and 2% THD ascorbate - the collagen signal peptide, the ECM-derived peptide system, and the vitamin C cofactor all within the same 40%-active formula.

Hydration - Dry to Dehydrated

Elasticity Reinforcing Lipid-Cream 5% Industry Peptide Complex (incl. Palmitoyl Pentapeptide-4) - 1.7 oz / 50 ml

The Lipid-Cream delivers the full peptide complex within the richest formula in the lineup - for dry and dehydrated skin that benefits from both deep emollience and active collagen-supporting peptide delivery.

WORKS TOGETHER WITH

ECM Peptide Complex Matrikynes® Bone Peptides

INCI: Hydrolyzed Cow Bone Extract.

A patent-pending concentrate of 315+ bioactive matrikine peptides at 3% in all four formulas. Synergy Note: Matrikynes® provides broad-spectrum ECM-derived matrikine signaling across 315+ peptide sequences; Palmitoyl Pentapeptide-4 adds a targeted, single-sequence collagen signal peptide with its own independent research base. Together they represent two different approaches to the same peptide-driven skin density goal, operating from different scientific traditions.

Signal Peptide Palmitoyl Hexapeptide-52

INCI: Palmitoyl Hexapeptide-52.

A co-formulated industry peptide in the five-peptide complex, studied in connection with visible firmness and elasticity appearance. Synergy Note: Palmitoyl Pentapeptide-4 and Palmitoyl Hexapeptide-52 are both palmitoylated signal peptides targeting different ECM-related sequences - their combined presence in the industry peptide complex provides multi-sequence peptide signaling at a single combined concentration.

Stable Vitamin C THD Ascorbate

INCI: Tetrahexyldecyl Ascorbate.

At 2% in both creams and 7% in the Oil-Serum, studied in connection with collagen-supportive activity as a vitamin C cofactor. Synergy Note: Palmitoyl Pentapeptide-4 is studied in connection with the peptide signal for collagen formation; THD ascorbate addresses the vitamin C cofactor associated with collagen cross-linking. These two actives work at complementary points in the same collagen formation context. 

Collagen Amino Acid Glycine

INCI: Glycine.

The most abundant amino acid in collagen, present in the eleven-amino-acid complex in all three water-based formulas alongside Palmitoyl Pentapeptide-4. Synergy Note: Palmitoyl Pentapeptide-4 is associated with the signaling dimension of collagen formation; glycine contributes the most structurally essential amino acid substrate - signal and substrate co-formulated in the same product.