Matrixyl

In simple words

Matrixyl is one of the most studied cosmetic peptides — a small piece of the collagen precursor molecule. It is studied as an ingredient that nudges the skin to produce new collagen and makes wrinkles shallower.

What this molecule is

Pal-Lys-Thr-Thr-Lys-Ser — 5 aa + a palmitoyl group. A fragment of the C-terminal propeptide of procollagen I. Patented (Sederma).

Why it is studied

A collagen synthesis stimulator — one of the most studied cosmetic peptides. Double-blind RCT 2023 + landmark clinical study 2005. Significant reduction in wrinkle depth and volume after 8–16 weeks. Mechanism: mimics collagen breakdown products → activates synthesis of new collagen.

How it works

KTTKS = a matrikine fragment of procollagen I → fibroblast receptors → activates the TGF-β cascade → ↑synthesis of collagen I, III, IV + fibronectin + hyaluronic acid. The palmitoyl group provides transdermal delivery across the skin's lipid barrier.

Doses used in studies

Studies used 2–5 ppm in a serum or cream twice a day for an 8–16-week course. A lasting effect was noted with regular use.

Combined with in studies

• Argireline/Leuphasyl — collagen + muscle relaxation = a complete approach
• Retinol — synergy in matrix remodeling
• Vitamin C — cofactor of collagen synthesis
• GHK-Cu — two peptides with different collagen receptors

Level of evidence

Level A Human clinical trials. There are randomized controlled trials (RCTs), or the compound has been approved by a regulatory agency. The most reliable level. Double-blind RCT 2023 + a solid clinical evidence base.

Important to know

⚠️ Patented ingredient (Sederma/Croda). Cosmetic, not pharmaceutical.

Studies in PubMed

1. Double-blind, Randomized Trial on the Effectiveness of Acetylhexapeptide-3 Cream and Palmitoyl Pentapeptide-4 Cream for Crow's Feet. (J Clin Aesthet Dermatol, 2023)
2. Topical palmitoyl pentapeptide provides improvement in photoaged human facial skin. (Int J Cosmet Sci, 2005)
3. Dermal Stability and In Vitro Skin Permeation of Collagen Pentapeptides (KTTKS and palmitoyl-KTTKS). (Biomol Ther (Seoul), 2014)
4. Effect of Palmitoyl-Pentapeptide (Pal-KTTKS) on Wound Contractile Process in Relation with Connective Tissue Growth Factor and α-Smooth Muscle Actin Expression. (Tissue Eng Regen Med, 2017)
5. The Effects of a Novel Series of KTTKS Analogues on Cytotoxicity and Proteolytic Activity. (Molecules, 2019)
6. Matrixyl Patch vs Matrixyl Cream: A Comparative In Vivo Investigation of Matrixyl (MTI) Effect on Wound Healing. (ACS Omega, 2022)