Matrixyl
Palmitoyl Pentapeptide-4 / Pal-KTTKS
Matrixyl (Palmitoyl Pentapeptide-4, also known as pal-KTTKS) is a cosmetic peptide consisting of a palmitoyl group attached to the pentapeptide lysine-threonine-threonine-lysine-serine, designed to stimulate collagen and extracellular matrix production in dermal fibroblasts. It was developed by Sederma and is one of the most extensively studied and commercially successful topical anti-aging peptides. Matrixyl functions as a matrikine, mimicking the activity of collagen breakdown fragments to signal fibroblasts to produce new collagen, fibronectin, and glycosaminoglycans.
Mechanism of Action
Lipopeptide consisting of a palmitoyl group linked to the pentapeptide KTTKS (a collagen I fragment). Acts as a matrikine, signaling fibroblasts to increase collagen I, III, and IV synthesis, fibronectin production, and hyaluronic acid production via TGF-beta pathway activation.
Research Protocols
For research purposes only. Not medical advice.
Topical application at 2-8% concentration in serums. Applied twice daily. Synergistic with retinol and vitamin C. Results visible after 8-12 weeks of consistent use. Not injected.
Research Notes
Clinical Research Status
Matrixyl has been the subject of multiple clinical studies demonstrating measurable anti-wrinkle efficacy when applied topically at concentrations of 2-5% in appropriate formulations. Double-blind placebo-controlled trials have shown statistically significant improvements in wrinkle depth, skin roughness, and overall photoaging scores after 2-4 months of regular application. It is widely incorporated into commercial skincare products and is recognized by dermatologists as one of the more evidence-based cosmetic peptides available.
Key Published Findings
In vitro studies demonstrate that Matrixyl stimulates collagen I synthesis by up to 350% and collagen IV synthesis by up to 200% in human fibroblast cultures at relevant concentrations. Clinical measurements using profilometry show wrinkle depth reduction of up to 36% after 4 months of twice-daily application in controlled studies. The palmitic acid chain enhances skin penetration and cell membrane interaction compared to the naked KTTKS peptide, which showed limited bioavailability without the lipophilic modification.
Safety Profile
Matrixyl has an excellent safety profile with no reported systemic side effects, sensitization, or phototoxicity in clinical testing, consistent with its topical application and local mechanism of action. Skin irritation is extremely rare and typically associated with other formulation ingredients rather than the peptide itself. It is considered safe for use during pregnancy and lactation at cosmetic concentrations, though formal reproductive toxicology studies have not been conducted.
Comparison to Related Compounds
Matrixyl 3000 is a newer generation product combining Matrixyl (pal-KTTKS) with palmitoyl tripeptide-1 for enhanced synergistic collagen stimulation through complementary pathways. Compared to retinoids, Matrixyl provides collagen stimulation without the associated irritation, photosensitivity, or retinization period, though efficacy is generally considered more modest. Argireline (acetyl hexapeptide-3) works through an entirely different mechanism (neuromuscular modulation) and is complementary rather than competitive with Matrixyl in anti-aging formulations.
Community Observations
Skincare enthusiasts consider Matrixyl one of the best-supported peptides for anti-aging, often incorporated into daily serums alongside vitamin C, niacinamide, and hyaluronic acid. Results are typically reported as gradual improvements in skin texture and fine line appearance over 2-3 months of consistent use. The peptide is available in numerous commercial products ranging from drugstore to luxury price points, with concentration and formulation quality varying significantly across brands.
Half Life
N/A (topical)
Reconstitution
N/A (topical formulation)
Storage
Lyophilized
Room temperature. Stable in cosmetic formulations.
Reconstituted
Stable in formulation. Protect from excessive heat.
US Legal Status
Also Known As
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