Peptide reference → Cognitive & neuro → Acetyl Hexapeptide-3 (Argireline)

Acetyl Hexapeptide-3 (Argireline)

Cosmetic

Cosmetic skincare peptide (expression lines) · also known as Argireline

Last updated 29 October 2026

Argireline (Acetyl Hexapeptide-3) is a widely used anti ageing cosmetic peptide, marketed to soften expression lines. It is often called a topical alternative to muscle relaxing injections. Used with no medicinal claims, it is regulated as a cosmetic ingredient.

Key points

Argireline is Acetyl Hexapeptide-3, one of the best known cosmetic peptides for expression lines.
It is marketed to ease the small muscle movements that crease the skin, softening lines.
On the skin, with no medicinal claims, it is regulated as a cosmetic ingredient in the UK.
The evidence is modest, and it is far milder than an injectable treatment.

Quick facts

What it is: Cosmetic skincare peptide (Acetyl Hexapeptide-3)
Marketed for: Softening expression lines
UK status: Legal as a cosmetic ingredient (no medicinal claims)
Evidence: Modest; among the better studied cosmetic peptides

How it works

Argireline is used in cosmetics with the aim of gently reducing the tiny muscle contractions that fold the skin into expression lines. Applied to the surface, its effect is far gentler than an injection. Much of the evidence comes from laboratory and manufacturer studies.

What the evidence shows

Argireline is one of the more studied cosmetic peptides, with some evidence for modest effects on the look of expression lines. Much of the research is from manufacturers, and independent high quality trials are limited, so claims should be kept modest.

What it does not settle

Independent high quality evidence is limited.
Effects are modest and build slowly.
Results depend on the product and how it is used.

Side effects

Common

Usually well tolerated, though some people get mild irritation or redness. A patch test is sensible.

Report any suspected side effect through the MHRA Yellow Card scheme.

UK legal status and access

As a topical cosmetic ingredient with no medicinal claims, Argireline is legal and widely sold in skincare. Any version sold with medicinal claims, or for injection, would fall under medicines rules.

Common questions

Is Argireline like Botox?

It is marketed as a topical alternative, but it works on the skin's surface and is far milder than an injectable muscle relaxing treatment.

Does it work?

It is among the better studied cosmetic peptides, with modest effects on expression lines that build slowly.

Factual reference only, not medical advice. We give no dosing for unlicensed compounds.

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