Matrixyl (Pal-KTTKS)

Overview

Matrixyl (palmitoyl pentapeptide-4, Pal-KTTKS) is a lipophilic pentapeptide conjugate representing a fragment of the type I procollagen C-propeptide (KTTKS, residues 1-5). The palmitoyl group provides membrane permeability for transdermal delivery. Matrixyl is among the most widely studied and commercially used anti-aging cosmeceutical peptides, with randomized controlled clinical trials demonstrating measurable reductions in wrinkle depth and improvements in skin texture. It works by acting as a matrikine—a matrix-derived signal peptide that feeds back to stimulate extracellular matrix synthesis.

Mechanism of Action

The KTTKS core sequence acts as a matrikine signal by binding to collagen-producing fibroblasts and upregulating expression of collagen I, collagen III, fibronectin, and hyaluronic acid. This signaling occurs via TGF-β receptor-independent pathways, activating downstream MAP kinase and AP-1 transcription factor elements to promote ECM gene expression. The palmitoyl group conjugation (at the N-terminus of lysine) dramatically enhances skin penetration by reducing the peptide's hydrophilicity and facilitating passive diffusion through the stratum corneum.

Potential Benefits

• Clinically demonstrated wrinkle depth reduction
• Collagen I and III synthesis stimulation
• Fibronectin and hyaluronic acid upregulation
• Improved skin texture and firmness
• Well-tolerated with decades of cosmeceutical safety data

Research Dosage Notes

The following reflects doses used in published research studies. This is not medical advice.

Topical: 3–5 ppm (parts per million) in cosmeceutical formulations. Typically 0.001–0.005% in final product.

Amino Acid Sequence

Side Effects & Safety

• Extremely well-tolerated topically
• Rare contact sensitization

Synergistic Compounds

The following compounds have been studied alongside Matrixyl (Pal-KTTKS) for potential complementary or synergistic effects:

Related Peptides

Learn More

References & Further Reading

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