Matrixyl
Cosmetic signal peptide
A palmitoyl pentapeptide studied in collagen-research and topical applications.
Overview
Matrixyl is a trade name for palmitoyl pentapeptide-4 (INCI; formerly palmitoyl pentapeptide-3), a lipidated matrikine peptide developed by Sederma for topical anti-aging cosmetics. Related products include Matrixyl 3000 and Matrixyl synthe'6, which use different peptide combinations.
At a glance
What Matrixyl does
Matrixyl (Palmitoyl Pentapeptide-4, the peptide pal-KTTKS) is a matrikine-based cosmetic peptide whose action is to signal skin fibroblasts to rebuild the dermal matrix — in effect telling the skin it needs to make more collagen. Its active core, the KTTKS sequence, is a fragment of the C-terminal propeptide of type I procollagen. When collagen is naturally degraded, fragments like KTTKS are released and act as 'matrikines' — biological messengers that cue fibroblasts to ramp up new extracellular-matrix synthesis. Matrixyl exploits this feedback loop, and the palmitoyl (fatty-acid) tail is attached to improve the peptide's ability to penetrate the lipid layers of skin.
Mechanistically, pal-KTTKS engages this matrikine signaling to increase fibroblast production of structural matrix proteins. In cultured human dermal fibroblasts it has been reported to raise type I collagen synthesis by roughly 100%+, type III collagen severalfold, and hyaluronic acid and fibronectin substantially — rebuilding both the collagen scaffold and the hydrating/adhesive components around it. It also shifts the MMP/TIMP balance, lowering collagen-degrading MMP-1 while raising its inhibitor TIMP-1, moving the dermis from a net-degrading toward a net-building state.
The evidence is stronger than for many cosmetic peptides: in addition to the in-vitro fibroblast data, a 12-week split-face randomized controlled trial (Robinson et al., 2005) reported improvements in wrinkle depth and skin roughness with a pal-KTTKS formulation. It is a topical cosmetic ingredient used at low concentrations (a few ppm), and unlike the SNARE peptides it works by stimulating matrix synthesis rather than relaxing muscle.
Effects reported in research
- Acts as a type I procollagen-derived matrikine, signaling fibroblasts to increase extracellular-matrix synthesis.
- Increased type I collagen synthesis by ~100%+ and type III collagen severalfold in human fibroblast cultures (in-vitro).
- Raised hyaluronic acid and fibronectin production in fibroblast cultures, rebuilding hydration and matrix scaffolding (in-vitro).
- Shifted the MMP/TIMP balance — lowered collagen-degrading MMP-1 and raised inhibitor TIMP-1 (in-vitro).
- Palmitoyl fatty-acid tail improves lipid-layer penetration compared with the bare KTTKS peptide.
- Improved wrinkle depth and skin roughness in a 12-week split-face randomized controlled human trial (Robinson 2005).
- Works by stimulating collagen/matrix building rather than relaxing muscle — mechanistically distinct from Argireline/SNAP-8.
- Used topically at very low concentrations (single-digit ppm) as a cosmetic anti-aging ingredient.
Effects listed reflect findings reported in the research literature — many in animal or in-vitro models. Listing an effect is not a claim of efficacy or a therapeutic indication in humans.
Mechanism of action
Matrixyl couples a matrikine pentapeptide (KTTKS, a fragment derived from type I collagen) to a palmitoyl group that improves skin penetration. The KTTKS motif is proposed to act as a signal fragment that stimulates fibroblasts to increase synthesis of extracellular matrix components such as collagen and glycosaminoglycans. This 'matrikine signaling' is the basis of its cosmetic use to improve skin firmness and reduce fine-line appearance.
Mechanistic description reflects published research-literature understanding. Much peptide research is preclinical (in-vitro or animal-model); mechanism in humans may differ and is not established for many compounds.
What it's studied for
Research contexts in which Matrixyl appears in the literature. Listing a research area is not a claim of efficacy or a therapeutic indication.
Key characteristics
- Palmitoylated pentapeptide (INCI: Palmitoyl Pentapeptide-4) based on the collagen-derived KTTKS fragment.
- Palmitoyl chain enhances lipophilicity and skin penetration.
- Acts as a matrikine to signal fibroblast extracellular-matrix synthesis.
- Common in leave-on anti-aging cosmetic formulations.
- Related but distinct from Matrixyl 3000 and Matrixyl synthe'6 blends.
Reported research dosing reference only
Educational reference, not dosing guidance. The figures below summarize amounts reported in published research and research-community protocols, provided for educational and research context only. They are not medical advice, not a recommendation, and not instructions for human use. Matrixyl is a research compound.
Matrixyl is a topical cosmetic peptide, so reported use is a formulation concentration rather than an injected dose. These are reference figures for research context only, not human dosing guidance.
- Effective topical range: ~10-100 ppm pure peptide (~0.001%-0.01%)
- Foundational clinical reference: 100 ppm (0.01%) pal-KTTKS
Active at very low concentrations; the palmitoyl group is included specifically to aid stratum-corneum penetration.
How it compares
Matrixyl works via matrikine collagen-stimulation signaling rather than the neurotransmitter/SNARE modulation attributed to Argireline and SNAP-8.
Commonly studied alongside
Compounds frequently researched together with Matrixyl in the literature. Cross-referenced for research context — not a usage or combination recommendation.
Handling & Stability
Lyophilized peptides are stored cold, protected from light, and reconstituted only at the time of intended in-vitro work.
- Avoid repeated freeze-thaw cycles
- Verify supplier lot and Certificate of Analysis
- Follow institutional lab-safety protocols
Analytical & COA Concepts
Reputable research suppliers publish a third-party Certificate of Analysis per batch. Key analytical concepts referenced in COAs include:
Category Context
Matrixyl sits in the Cosmetic & Dermal area of the PeptiDex library.
- Entry type: Research compound reference
- Browse the full library →
- Glossary of terms →
Where researchers source Matrixyl
For researchers studying Matrixyl, third-party suppliers such as Practically Natty Peptides offer research-grade material with third-party Certificates of Analysis and US-based shipping.
PeptiDex does not maintain a direct supplier listing for this compound. The link above goes to a third-party research-supplier directory.
Frequently asked questions
What is Matrixyl?
Matrixyl (palmitoyl pentapeptide-4, Pal-KTTKS) is a topical cosmetic lipopeptide consisting of the pentapeptide KTTKS (a fragment of type I procollagen) conjugated to a palmitic-acid chain that improves skin penetration. It is used as a collagen-signaling anti-aging ingredient.
How does Matrixyl work?
The KTTKS motif is a fragment released during collagen breakdown that acts as a feedback signal to fibroblasts. In cell-culture research, Pal-KTTKS has been reported to stimulate synthesis of collagen and extracellular-matrix components such as fibronectin, which underlies its use in skin-firming formulations.
What topical concentration of Matrixyl is used?
The effective range cited is roughly 10-100 ppm of pure peptide (about 0.001%-0.01%). The foundational clinical study used pal-KTTKS at 100 ppm (0.01%) versus vehicle, indicating biological activity even at very low concentrations.
What is the sequence and molecular weight of Matrixyl?
Matrixyl is Pal-Lys-Thr-Thr-Lys-Ser (Pal-KTTKS); the palmitoylated molecule has a molecular weight of about 802 Da, while the KTTKS peptide alone is about 564 Da. The palmitoyl chain is what allows the otherwise hydrophilic peptide to cross the lipid-rich stratum corneum.
How does Matrixyl differ from Argireline or SNAP-8?
Matrixyl is a collagen-stimulating (matrix-signaling) peptide, whereas Argireline and SNAP-8 are neuro-signaling peptides that target expression-line muscle contraction. Because the mechanisms are complementary, they are often formulated together.
Is Matrixyl injected?
No. Matrixyl is a topical cosmetic ingredient applied to the skin surface, not an injectable drug, and is not FDA-approved for treating any medical condition.
Answers are educational summaries of research-literature context and do not constitute medical advice. See the Research Library, COA guide, and Storage & Handling guide for more.