Ingredient review

Myristoyl Pentapeptide-4

INCI: MYRISTOYL PENTAPEPTIDE-4

A well-studied peptide that may help reduce fine lines and improve skin firmness with consistent use, though results are gradual.

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In plain English

Myristoyl Pentapeptide-4 is a lab-made protein fragment that signals your skin to produce more collagen, the protein that keeps skin plump and firm. Think of it as a tiny messenger that tells your skin cells to get to work repairing and rebuilding. It's often found in anti-aging products and is generally well-tolerated, but it's not a quick fix—you'll need to use it for weeks to see subtle improvements.

Review score

Safety, usefulness, and evidence

4.3Good
4.3/ 5

Strong fit for many routines

The evidence base is useful, but some claims depend heavily on the formula.

Risk flags are low for most users, though the finished product can still irritate.

Source
synthetic
Evidence
moderate
Irritation
low
Clogging risk
low
How reviews are scored

Quick decision guide

Easy yes for most routines

Myristoyl Pentapeptide-4 is generally a lower-concern ingredient when the full formula suits your skin.

Plain-English read

Treat this as a practical screening step before you compare products that contain this ingredient.

  1. Step 1Start with the score, then check the irritation and clogging risk before judging Myristoyl Pentapeptide-4.
  2. Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
  3. Step 3If a product stings, breaks you out, or worsens irritation, judge the finished formula and stop using it even if the ingredient scores well.

Score terms in plain English

Irritation risk

low

Less likely to sting, burn, or bother most users, though sensitive skin can still react.

Clogging risk

low

Less likely to feel heavy or contribute to clogged pores for most skin types.

Evidence level

moderate

There is useful support, but formula details and claim strength still matter.

What it is

A synthetic pentapeptide (a chain of five amino acids) attached to a myristoyl fatty acid chain, which helps it penetrate the skin more effectively. It is a variant of the more commonly known Palmitoyl Pentapeptide-4 (Matrixyl).

How it works

Once applied to the skin, the myristoyl group helps the peptide penetrate the outer layer. Inside, it mimics a natural collagen fragment, binding to receptors on fibroblasts (collagen-producing cells) and stimulating them to produce more collagen and other extracellular matrix components. This can lead to improved skin firmness and a reduction in the appearance of fine lines over time.

Pros

Gentle anti-aging support

Myristoyl Pentapeptide-4 is well-tolerated by most skin types, including sensitive skin, making it a good option for those who find retinoids too harsh.

Backed by research

Multiple studies have shown that this peptide can stimulate collagen production and reduce wrinkle depth with consistent use over several weeks.

Cons and cautions

Subtle, slow results

Unlike retinoids, which can produce more noticeable changes, this peptide works gradually and may require months of daily use to see visible improvements.

Variable effectiveness

The concentration and formulation of the product matter a lot. A low concentration or poor delivery system may result in little to no benefit.

Best for

  • Adults looking for a gentle anti-aging ingredient
  • Those with sensitive skin who cannot tolerate retinoids
  • People wanting to support collagen production as part of a preventive routine

Use caution if

  • Individuals with known allergies to peptides (rare)
  • Those expecting immediate, dramatic results

Usage tips

Apply after cleansing and before heavier creams to allow better absorption.
Use consistently twice daily for at least 8-12 weeks to evaluate results.
Layer with a moisturizer containing ceramides or niacinamide for added skin barrier support.

Safety summary

Myristoyl Pentapeptide-4 is considered safe for cosmetic use at typical concentrations. It has a low irritation and comedogenic risk. Allergic reactions are rare but possible. Always patch test a new product.

Research notes

Clinical studies, including a 12-week double-blind trial, have shown that formulations containing this peptide can reduce wrinkle depth and improve skin firmness. However, most studies are small and funded by ingredient manufacturers, so results should be interpreted with caution.

Common label clues

Typical concentration
Typically used at 0.001% to 0.01% in leave-on products
Regulatory status
Approved as a cosmetic ingredient in the US, EU, and many other regions. Not classified as a drug, so anti-aging claims are limited to cosmetic benefits.
Common uses
Anti-aging serums, Eye creams, Moisturizers, Neck creams
Environmental note
Synthetically produced, so it does not rely on animal or plant harvesting. Its environmental impact is minimal compared to some natural extracts.

Good to know

  • Myristoyl Pentapeptide-4 is often listed as 'Matrixyl' on ingredient labels, though Matrixyl is a trademarked blend that may contain other peptides.
  • It is stable in most formulations and does not require special packaging like vitamin C.

Common questions

What is Myristoyl Pentapeptide-4 in beauty products?

Myristoyl Pentapeptide-4 is a lab-made protein fragment that signals your skin to produce more collagen, the protein that keeps skin plump and firm. Think of it as a tiny messenger that tells your skin cells to get to work repairing and rebuilding. It's often found in anti-aging products and is generally well-tolerated, but it's not a quick fix—you'll need to use it for weeks to see subtle improvements.

What does Myristoyl Pentapeptide-4 do in a beauty product?

Once applied to the skin, the myristoyl group helps the peptide penetrate the outer layer. Inside, it mimics a natural collagen fragment, binding to receptors on fibroblasts (collagen-producing cells) and stimulating them to produce more collagen and other extracellular matrix components. This can lead to improved skin firmness and a reduction in the appearance of fine lines over time.

Is Myristoyl Pentapeptide-4 safe for most people?

Myristoyl Pentapeptide-4 is considered safe for cosmetic use at typical concentrations. It has a low irritation and comedogenic risk. Allergic reactions are rare but possible. Always patch test a new product.

Who should be careful with Myristoyl Pentapeptide-4?

Individuals with known allergies to peptides (rare) Those expecting immediate, dramatic results

Research sources

PubMed study on Matrixyl and wrinkle reductionOpenCosmetic Ingredient Review safety assessmentOpenINCI database entryOpen

Ingredient reviews are educational and are not medical advice. Patch test new products and ask a licensed clinician about persistent irritation, allergies, pregnancy-specific questions, or diagnosed skin conditions.