Skin Palmitoyl Pentapeptide-4 (Pal-KTTKS)

Matrixyl

Palmitoyl Pentapeptide-4 · Matrixyl 3000 · Pal-KTTKS

Evidence: Studied in humans. Example dose: finalize with a provider. Not a fact-check stamp.

3-5% formulation – 8-10 % Topical 1-2x daily

Lipidated Cosmetic PeptideCollagen-Stimulating CosmeceuticalCosmetic Ingredient (not pharmaceutical)

Matrixyl (Palmitoyl Pentapeptide-4, Pal-KTTKS) is a cosmetic peptide developed by Sederma (Croda) consisting of the 5-amino-acid sequence Lys-Thr-Thr-Lys-Ser conjugated to a palmitic acid (C16) tail. The pentapeptide sequence is derived from the C-terminal collagen propeptide that is normally cleaved during collagen maturation - in skin biology this fragment provides feedback signaling to fibroblasts to make more collagen. The palmitoylation enables transdermal penetration of an otherwise hydrophilic peptide.

Quick Start

Route

Topical (only)

Start low

3-5% formulation Topical

Frequency

1-2x daily

Timing

Independent

Starting dose. 3-5% formulation

Apply to clean skin AM and PM. Combine with moisturizer and SPF (AM). Continuous use required for cumulative effect.

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Start here. Every protocol below is ordered lowest-first. Begin at the smallest effective dose, hold about a week to assess tolerance, and step up only if needed.

Tiered Protocols · lowest first

Conservative start

3-5% formulation · Topical (only) · 1-2x daily

conservative starter

3-5% formulation

1-2x daily

Standard

Collagen Wrinkle Reduction

8-10 % · Topical · Daily

in vitro · Jones et al. 2013, Molecular Pharmaceutics 10(3):1063-1069

Apply to clean skin. Highly effective, non-irritating alternative to retinoids for fine line reduction. The study cited here is laboratory cell research. A concentration in a dish is not a dose, so this amount is community practice rather than a trial result.

8-10 %

Daily

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How it works

Matrixyl works by mimicking the natural collagen feedback signal:

KTTKS Sequence

The 5-amino-acid peptide sequence Lys-Thr-Thr-Lys-Ser is derived from the C-terminal propeptide of pro-collagen I, which is cleaved during collagen maturation. This cleaved fragment provides paracrine signaling to fibroblasts to upregulate collagen and matrix protein synthesis - completing a feedback loop that maintains tissue repair signaling.

Palmitoylation

The C16 palmitic acid conjugate enables the otherwise hydrophilic pentapeptide to traverse the stratum corneum lipid barrier and reach dermal fibroblasts. Without palmitoylation, KTTKS has minimal topical bioavailability.

Fibroblast Activation

Once internalized by fibroblasts, Matrixyl upregulates expression of collagen type I, collagen type III, fibronectin, glycosaminoglycans, and elastin - the structural matrix proteins that provide skin firmness.

Modest Effect Size

Matrixyl produces measurable but modest improvements in wrinkle depth and skin firmness over 8-12 weeks of consistent topical application. Effect sizes are smaller than retinoids and dramatically smaller than injectable interventions.

No Met or Cys

KTTKS sequence contains no sulfur-containing residues - chemistry-compatible with copper peptides like GHK-Cu in cosmetic formulations.

What to expect

Early

Days 1–7

Weeks 1-4: minimal subjective change.

Mid

Weeks 2–4

Weeks 4-12: subtle smoothness and firmness improvement.

Later

Weeks 4–12

Weeks 12+: visible cosmetic effect on fine lines.

Evidence

HumanPresent

AnimalPresent

In-vitroPresent

Each reference below was re-fetched from its PubMed record, and the quoted sentence was confirmed to appear in that abstract and to support the claim it sits under. Follow any of them to read the source.

Evidence boundary from the checked abstract: Remarkably, GAO can significantly improve the sparingly soluble properties of palmitoyl pentapeptide-4 (PAL-4), a model peptide drug.

Remarkably, GAO can significantly improve the sparingly soluble properties of palmitoyl pentapeptide-4 (PAL-4), a model peptide drug.

Bioactive Glycyrrhizic Acid Ionic Liquid Self-Assembled Nanomicelles for Enhanced Transdermal Delivery of Anti-Photoaging Signal Peptides. Advanced science (Weinheim, Baden-Wurttemberg, Germany) · 2025 · PMID 39783908

Evidence scope. This entry supports only the exact statement quoted from the live abstract; it does not independently verify OnePin's displayed dose, route, frequency, formulation, population, or broader mechanism.

Claims we could not support

No abstract we checked supports these for this molecule at this route. That is not the same as saying they are false — it marks where the evidence is missing.

Dose/route: 3-5% formulation; Topical (only); 1-2x daily. No checked live PubMed abstract verified this exact displayed dose, route, and frequency for the same molecule/formulation and relevant population.

Primary safety claim: No primary safety text present in source JSON. No checked live PubMed abstract directly verified this source-JSON safety claim at the displayed formulation, route, and regimen.

Side effects & safety

Commonly reported

Mild skin irritation (rare)
Mild redness at application site

Less common & notes

Allergic reaction to peptide or formulation.
Long-term safety profile is excellent (decades of cosmetic use).
Modest effect size means dissatisfaction with magnitude is the most common 'complaint.'

Pharmacokinetics

Illustrative plasma concentration · 17 h

Half-life

Topical; minimal systemic absorption

Peak · Tmax

Topical 2-4 hours

Elimination

Days to weeks for cumulative effect

Bioavailability

Topical via palmitoyl-mediated penetration

Duration of action

Continuous use for sustained effect

Clearance

Local proteolysis

Storage. Topical formulations: room temperature stable per manufacturer. Lyophilized peptide: refrigerate, light-sensitive.

Regulatory status

Cosmetic ingredient (not pharmaceutical). Approved as cosmetic ingredient in EU, US, and most jurisdictions. Sederma/Croda maintains the ingredient registration.

Put it to work

Calculate, log & track

Open Matrixyl straight into OnePin with your vial and dose pre-filled, then let it handle the syringe math and remind you before the vial runs out.

Open Matrixyl in the app →

Go deeper

The guide & community

The complete Matrixyl walkthrough, real protocol discussion and coaching live inside the BlessUp community on Skool.

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