# Matrixyl and Argireline

The two best-known peptides in skin creams. Matrixyl is meant to signal skin to make collagen, and Argireline is sold as a mild muscle relaxer for expression lines. As cosmetics, neither had to prove it works before sale.

Also called: Palmitoyl pentapeptide-4, Acetyl hexapeptide-8, Signal peptides
Source page: https://peplogue.com/peptides/cosmetic-peptides/
Updated: 2026-10-22. Not medical advice.

## How it works

- Where it acts: Matrixyl signals skin cells to make collagen. Argireline interferes with the nerve signal to small face muscles.
- What it changes: Small changes in skin collagen and in the depth of expression lines, mostly in company-funded studies.
- What people notice: Subtle at best, and only where the cream is applied.

## What the evidence shows

- **Fine lines and wrinkles**: Early. Small trials, many unpublished or run by ingredient makers. In one, a 10% Argireline cream cut wrinkle depth by about 30% in 10 women over 30 days. A study by the Matrixyl maker reported 18% shallower folds after 28 days.

## Side effects and risks

- common: Occasional irritation. Published safety data are thin.

Who should avoid it: Nobody in particular. Patch-test if your skin is reactive.

## How it is used

Applied to the skin once or twice a day. Trials ran from four weeks to four months.

## Legal status

- United States: undefined. Cosmetics. Under US law, a product that claims to change skin structure counts as a drug.
- European Union: undefined. Cosmetics.
- Spain: undefined. Sold as cosmetics under EU Regulation 1223/2009 and Spain's RD 85/2018. No prescription needed. Not medicines; they cannot claim to treat disease.
- Germany: undefined. Sold as cosmetics under EU cosmetics law; the maker must hold a safety assessment. No prescription needed.
- France: undefined. Peptide creams stay authorised as cosmetics. ANSM's 2026 alert targets injectable peptides, not creams.
- Italy: undefined. Cosmetics under EU Reg. 1223/2009, sold without prescription. Need an EU responsible person and notification before sale. Injected products are not cosmetics.
- Netherlands: undefined. Sold as cosmetics under EU Regulation 1223/2009: notified in the CPNP portal, not approved beforehand. NVWA can inspect the safety report.
- United Kingdom: undefined. Cosmetics.
- Canada: undefined. Cosmetics.
- Australia: undefined. Cosmetics.

## Questions people ask

**Do peptide creams actually work?**

The effects are subtle at best and only where the cream is applied. Small trials, many unpublished or run by ingredient makers, report small changes in collagen and in the depth of expression lines.

**Is Argireline a muscle relaxer?**

It is sold as a mild one: it interferes with the nerve signal to small face muscles. In one small study, an Argireline cream cut wrinkle depth by about 30% in 10 women over 30 days.

**What does Matrixyl do?**

Matrixyl is meant to signal skin cells to make collagen. A study by the Matrixyl maker reported 18% shallower folds after 28 days.

**Are peptide creams safe?**

Occasional irritation is reported, and published safety data are thin. Patch-test if your skin is reactive.

**Why do peptide creams not have to prove they work?**

They are sold as cosmetics, so neither had to prove it works before sale. Under US law, a product that claims to change skin structure counts as a drug.

## Sources

- Schagen 2017: topical peptide treatments with effective anti-aging results: https://www.mdpi.com/2079-9284/4/2/16
- FDA: wrinkle treatments and other anti-aging products: https://www.fda.gov/cosmetics/cosmetic-products/wrinkle-treatments-and-other-anti-aging-products