Last Updated on April 2, 2026 by omgbart
Acetyl hexapeptide is one of the more interesting ingredients in skincare. It works by interfering with the neurotransmitter signals that cause facial muscles to contract repeatedly, which over time creates expression lines. It does not freeze anything. It softens. The effect is subtle and cumulative, and it works best on skin that is already showing early signs of repeated movement.
The Ordinary Argireline serum puts that ingredient to work at 10% concentration, making it one of the highest-strength acetyl hexapeptide formulas available without a prescription and at a price point that removes any barrier to trying it.
What is acetyl hexapeptide?
Acetyl hexapeptide-3, also known as acetyl hexapeptide-8 or Argireline, is a synthetic peptide that mimics the mechanism of botulinum toxin without the injection. It disrupts the SNARE protein complex involved in muscle contraction, reducing the frequency and depth of repetitive facial movements. Clinical studies have shown measurable reduction in the depth of expression lines with consistent topical use, particularly around the forehead and eye area.
It is not a replacement for Botox. Nothing topical is. But as a supportive treatment for early expression lines, or as a maintenance step between procedures, it is one of the most evidence-backed options available over the counter.
The Ordinary Argireline serum formula
The formula is simple by design. It is a water-based serum with 10% acetyl hexapeptide-8, a low-viscosity clear liquid that absorbs immediately and leaves no residue. The ingredient list is short, which is appropriate for a treatment serum that will be layered under other products. No fragrance, no essential oils, no potential sensitisers.
The texture is a weightless clear gel. It has no scent. One to two drops covers the forehead. A second application addresses the eye area and corners of the mouth.
How to use it
Apply to clean skin as a first-to-skin step, before serums, oils, or moisturiser. Press it in rather than rubbing to avoid disturbing the film as it sets. Wait a minute before layering anything over the top.
Use it morning or evening. Most people use it in the morning because the immediate smoothing effect works well as a base before SPF or any coverage products. For best results, use it consistently rather than occasionally. Acetyl hexapeptide is a cumulative ingredient.
Do not mix it with strong vitamin C formulas in the same application. Water-based serums with high concentrations of ascorbic acid can destabilise peptides. Apply vitamin C separately or at a different time of day.
Results
The immediate smoothing effect is real and visible within minutes of application. The forehead in particular responds noticeably. Long-term reduction in line depth takes four to six weeks of daily use. My skin shows the most difference in the forehead and around the eyes, which are the areas I target.
At this concentration and price point, The Ordinary Argireline serum is the most accessible entry point to acetyl hexapeptide in skincare. If you have been curious about faux-tox serums and do not want to pay the premium that comes with branded peptide treatments, this is where to start.
Shop The Ordinary Argireline 10% Serum at The Ordinary →
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