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Cosmetic OTCTopical Only+2 more

Matrixyl (Palmitoyl Pentapeptide-4)

A palmitoylated pentapeptide that signals fibroblasts to make more type I collagen. We read all 20 studies. The protocol is below.

Updated 03 May 2026Read 10 minEvidence ●●●○○Citations 20
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The Matrixyl (Palmitoyl Pentapeptide-4) Report · $19

Everything you need to start: dose, sourcing, safety, our verdict.

One purchase · yours forever

Built from 20 cited studies.

Status
OTC
Class
Topical Only
Evidence
3/ 5●●●○○
Regulatory status
$19 ↓
Foundational RCT (Robinson 2005)
$19 ↓
Mechanism
$19 ↓
Read this if
  • you read Paula's Choice or shop The Ordinary and want to know which peptide actually has data
  • you're building a routine around tretinoin and want a complement that won't fight it
  • you're 30+ and looking for a topical that beat placebo in a real dermatology trial
  • you're trying to tell the difference between Matrixyl, Matrixyl 3000, and Matrixyl synthe'6 (the name covers three different products with three different data sets)
Skip this if
  • you expect retinoid-level results — Matrixyl is smaller, slower, gentler
  • you haven't fixed your sunscreen yet — fix that first
  • you have a known peptide or palmitate allergy
  • you can't separate the peptide step from low-pH actives (vitamin C, AHA/BHA) — Matrixyl stability drops below pH ~5; if your whole routine is acidic, the peptide is inactivated before it does anything. Apply Matrixyl AM and the acids PM (or vice versa). Retinoids are different — they pair well with Matrixyl on the same routine (additive collagen signal), so layering or alternating nights is fine.
The 4 ways you can buy Matrixyl (Palmitoyl Pentapeptide-4)
Brand
✗
No FDA approval
Compounded 503A
✗
No 503A pathway
RUO (research-only)
✓
Self-source
Gray market
✓
Overseas import
Click any lane for the full Sourcing breakdown.
First 90 days · Matrixyl (Palmitoyl Pentapeptide-4)
Weeks 1–2
Tolerability check. Mild contact irritation or transient redness is normal for the first 1–2 weeks. Stop and patch-test if you get persistent dermatitis.
Weeks 4–8
Texture changes if it's going to work. Take a baseline photo at week 0 — week 8 vs baseline is the honest comparator. Your memory of how your skin looked is unreliable.
Week 12 — decide
Side-by-side photo decision. Cosmetic peptide effects are slow and modest. Anyone promising fast dramatic results is selling marketing, not skin biology.
Quit if
  • Persistent contact dermatitis or worsening irritation.
  • No perceived change in week 8 and week 12 photo comparisons (cosmetic peptides usually take longer than 12 weeks, but at 16 weeks if nothing has changed, the formulation isn't reaching the target).
  • Any pigmentation changes that persist after stopping.
Identity

What it is.

Matrixyl is a brand name from Sederma, a French cosmetic-ingredient company. The original Matrixyl is a called palmitoyl pentapeptide-4 (Pal-KTTKS) — a five-amino-acid fragment of type I collagen, attached to a fatty palmitic-acid tail to help it cross the skin barrier. Matrixyl 3000 is a related blend (palmitoyl tripeptide-1 + palmitoyl tetrapeptide-7).

The mechanism story: the fragment looks to skin cells like a tiny piece of broken collagen, which signals the cell to ramp up new collagen production as if it were repairing a wound. Topical application is meant to drive collagen synthesis in the dermis, improving firmness and reducing fine lines.

It's been a workhorse ingredient in cosmetic skincare since the early 2000s. Found in everything from luxury serums to drugstore moisturizers. Sederma has published a substantial body of supporting research, and independent dermatology research has touched the molecule too.

TL;DR

TL;DR. 30-second version.

The compressed verdict — what Matrixyl (Palmitoyl Pentapeptide-4) actually is, what the human evidence shows, and the watch-for in three bullets. Locked.

Get the report · $19 ↓
Mechanism

Mechanism.

Mechanism · in the Matrixyl (Palmitoyl Pentapeptide-4) report

How the molecule actually works — receptor profile, downstream signaling, what to expect mechanistically.

Get the report · $19 ↓
Evidence

Evidence. What we actually know in humans.

Evidence · in the Matrixyl (Palmitoyl Pentapeptide-4) report

The trial breakdown — phase, n, primary endpoint, who funded, what hit, what didn't.

Get the report · $19 ↓
Human-Evidence Factbox
Regulatory status
$19 ↓
Foundational RCT (Robinson 2005)
$19 ↓
Mechanism
$19 ↓
Effect size vs vehicle
$19 ↓
Effect size vs retinoid
$19 ↓
Safety record (topical)
$19 ↓
"Matrixyl" covers
$19 ↓
Original Matrixyl INCI
$19 ↓
Matrixyl 3000 INCI
$19 ↓
Matrixyl synthe'6 INCI
$19 ↓
Stack conflict — low-pH actives
$19 ↓
Stack pairing — retinoids
$19 ↓
Dose

Dose. The actual protocol.

Dose · in the Matrixyl (Palmitoyl Pentapeptide-4) report

The specific protocol — dose, titration schedule, cycle pattern, frequency, route.

We read 20 studies to write this report.
Get the report · $19 ↓
Sourcing

Sourcing. Where the cohort actually buys.

Sourcing · in the Matrixyl (Palmitoyl Pentapeptide-4) report

Sourcing breakdown — vendor methodology, red flags, our published test results, COA checklist.

We read 20 studies to write this report.
Get the report · $19 ↓
Safety

Safety. Side effects.

Safety · in the Matrixyl (Palmitoyl Pentapeptide-4) report

The watch-for list — contraindications, drug interactions, monitoring labs, when to stop.

Get the report · $19 ↓
Editorial Position

Editorial position.

Editorial Position · in the Matrixyl (Palmitoyl Pentapeptide-4) report

Our editorial position — explicit yes / no / depends, with the reasoning behind it.

Get the report · $19 ↓
Citations

Citations.

  1. 01Wang Z, et al. Bioactive Glycyrrhizic Acid Ionic Liquid Self-Assembled Nanomicelles for Enhanced Transdermal Delivery of Anti-Photoaging Signal Peptides. Advanced science (Weinheim, Baden-Wurttemberg, Germany). 2025;12(8):e2412581. PMID: 39783908.
  2. 02Park H, et al. Effect of Palmitoyl-Pentapeptide (Pal-KTTKS) on Wound Contractile Process in Relation with Connective Tissue Growth Factor and α-Smooth Muscle Actin Expression. Tissue engineering and regenerative medicine. 2017;14(1):73-80. PMID: 30603464.
  3. 03Vitali A, et al. Liposome Encapsulation of the Palmitoyl-KTTKS Peptide: Structural and Functional Characterization. Pharmaceutics. 2024;16(2). PMID: 38399273.
  4. 04Choi YL, et al. Dermal Stability and In Vitro Skin Permeation of Collagen Pentapeptides (KTTKS and palmitoyl-KTTKS). Biomolecules & therapeutics. 2014;22(4):321-7. PMID: 25143811.
  5. 05Rasouli M, et al. Mesenchymal stem cell therapy using Pal-KTTKS-enriched carboxylated cellulose improves burn wound in rat model. Archives of dermatological research. 2024;316(7):353. PMID: 38850353.
+Show all 20 citations
  1. 06Tałałaj U, et al. The Effects of a Novel Series of KTTKS Analogues on Cytotoxicity and Proteolytic Activity. Molecules (Basel, Switzerland). 2019;24(20). PMID: 31618846.
  2. 07Mortazavi SM, et al. Effect of Palmitic Acid Conjugation on Physicochemical Properties of Peptide KTTKS: A Preformulation Study. Journal of cosmetic science. 2019;70(6):299-312. PMID: 31829923.
  3. 08Aruan RR, et al. Double-blind, Randomized Trial on the Effectiveness of Acetylhexapeptide-3 Cream and Palmitoyl Pentapeptide-4 Cream for Crow's Feet. The Journal of clinical and aesthetic dermatology. 2023;16(2):37-43. PMID: 36909866.
  4. 09Robinson LR, et al. Topical palmitoyl pentapeptide provides improvement in photoaged human facial skin. International journal of cosmetic science. 2005;27(3):155-60. PMID: 18492182.
  5. 10Trashi O, et al. Dually functionalized dendrimer for stimuli-responsive release of active ingredients into the skin. Acta biomaterialia. 2025;193:571-583. PMID: 39694719.
  6. 11Osborne R, et al. Practical application of cellular bioenergetics to the care of aged skin. The British journal of dermatology. 2013;169 Suppl 2:32-8. PMID: 23786618.
  7. 12Osborne R, et al. Application of genomics to breakthroughs in the cosmetic treatment of skin ageing and discoloration. The British journal of dermatology. 2012;166 Suppl 2:16-9. PMID: 22670614.
  8. 13Paccola AGL, et al. Synergistic Effects of Injectable Platelet-Rich Fibrin and Bioactive Peptides on Dermal Fibroblast Viability and Extracellular Matrix Gene Expression: An In Vitro Study. Molecules (Basel, Switzerland). 2025;30(16). PMID: 40871567.
  9. 14Errante F, et al. Susceptibility of cosmeceutical peptides to proteases activity: Development of dermal stability test by LC-MS/MS analysis. Journal of pharmaceutical and biomedical analysis. 2021;194:113775. PMID: 33281001.
  10. 15Chirita RI, et al. Development of a LC-MS/MS method to monitor palmitoyl peptides content in anti-wrinkle cosmetics. Analytica chimica acta. 2009;641(1-2):95-100. PMID: 19393372.
  11. 16Osborne R, et al. Understanding metabolic pathways for skin anti-aging. Journal of drugs in dermatology : JDD. 2009;8(7 Suppl):s4-7. PMID: 19623777.
  12. 17Flagler MJ, et al. Combinations of peptides synergistically activate the regenerative capacity of skin cells in vitro. International journal of cosmetic science. 2021;43(5):518-529. PMID: 34272744.
  13. 18Kaczvinsky JR, et al. Efficacy of anti-aging products for periorbital wrinkles as measured by 3-D imaging. Journal of cosmetic dermatology. 2009;8(3):228-33. PMID: 19735523.
  14. 19Bjerke DL, et al. A framework for the safety evaluation of peptides in cosmetics. Current research in toxicology. 2026;10:100291. PMID: 41953401.
  15. 20Mohammed YH, et al. Microneedle enhanced delivery of cosmeceutically relevant peptides in human skin. PloS one. 2014;9(7):e101956. PMID: 25033398.
The Matrixyl (Palmitoyl Pentapeptide-4) Report · $19

Everything you need to start.

Dose, sourcing, safety, our verdict. One purchase. Yours forever.

Built from 20 cited studies.

Or get every report. All reports — $99 once · Pro — $29/mo.
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