Is it really like Botox?

They interfere with the same protein complex, and that is where the resemblance ends. Botulinum toxin is injected into the muscle and enzymatically destroys the target protein; argireline sits on the skin surface and competes with it weakly, if it gets through at all. The published effects are a fraction of what injection produces.

Does a higher percentage work better?

Not reliably. Penetration is the bottleneck, so the vehicle and delivery system matter more than the concentration. A 10% serum in a formulation that does not carry the peptide through the skin will do less than a well-formulated 5% one.

Can I mix my own from raw powder?

You can, and the problem is preservation rather than chemistry. A home mix has no preservative system, will grow bacteria within days to weeks, and is being applied next to your eyes. The saving is not worth that.

How long until I see anything?

The studies measured over four to eight weeks of twice-daily use. Nothing about this is visible in days.

Skin & hair

Argireline

Acetyl Hexapeptide-8 · Acetyl Hexapeptide-3 · Acetyl hexapeptide-8 argireline

Early human trialsReviewed 16 Aug 2026

Argireline is a six-amino-acid peptide found in a great many anti-wrinkle serums. Its marketing has always leaned on a comparison to botulinum toxin, and the comparison is not baseless. Both interfere with the same protein complex that nerve endings use to release acetylcholine, so both reduce muscle contraction in principle.

In practice the difference is enormous. Botulinum toxin is injected directly into the muscle and enters the nerve terminal enzymatically; argireline is applied to the skin surface and has to cross the stratum corneum, the barrier specifically evolved to keep molecules out. How much of a 1.6 kDa peptide reaches the facial muscles below is the central open question, and the honest answer is: not much, and less than the marketing implies.

What the published studies show is a small measurable reduction in wrinkle depth: around 10 to 30% in the studies most often cited, over four to eight weeks, on expression lines around the eyes. Those are real measurements, several of them industry-funded and small. It is a modest cosmetic effect, and on a site mostly concerned with injectable compounds and serious risks, it is worth noting that this one carries almost none.

How it works

Neurotransmitter release at the neuromuscular junction depends on the SNARE complex, a set of proteins that pulls a vesicle into contact with the cell membrane so it can release its contents. Argireline mimics a segment of SNAP-25 — one of those proteins — and competes for a place in the complex. A complex that assembles slightly less efficiently releases less acetylcholine, and the muscle contracts slightly less.

Botulinum toxin acts on the same system by a different and far more decisive route: it enzymatically cleaves SNAP-25, destroying it. Competitive interference and enzymatic destruction are not the same magnitude of intervention, which is the main reason the effects are not comparable.

The limiting factor is delivery. The stratum corneum excludes most molecules above about 500 daltons, and argireline is roughly three times that. Formulation, meaning liposomes and penetration enhancers and the vehicle, probably matters more to whether a product works than the peptide concentration on the label.

There is a secondary proposed mechanism involving reduced catecholamine release, which is less studied and less often invoked.

Quick reference

Commonly described dose: 25 mg–50 mg
How often: Applied twice daily
Route: Topical
Where: Crow's feet, Forehead, Between the brows
Timing: Twice daily, morning and evening, to clean skin.
Storage once mixed: Refrigerated, 14 days

These describe what sources report, not what you should do. Full detail and provenance in the dosing section below.

Price index

Per-milligram pricing across vendors arrives with the directory. We are recording prices now so the history exists when the page ships.

Vocabulary on this page

Bioavailability: How much of an administered dose actually reaches the bloodstream. Injection is close to complete; swallowing a peptide is usually close to nothing.
Concentration: How much peptide there is in each millilitre of solution, once the vial has been reconstituted.
Reconstitution: Adding liquid to a freeze-dried peptide powder to turn it into a solution that can be drawn into a syringe.
Peptide: A short chain of amino acids: the same building blocks as a protein, in a chain short enough to behave differently.

The whole glossary →

Regulatory status — United States

Sold as a cosmetic ingredient, not a drug, in the United States, the European Union and elsewhere. Cosmetics are not assessed for efficacy before sale, and claims must stay within cosmetic language. That is why products describe the appearance of wrinkles instead of treating them.

Last reviewed 16 Aug 2026. Regulatory positions in this category change frequently; we date this line so you can see how current it is.

What it is studied for

Each entry states the evidence behind it. We do not rank indications by effectiveness — for most compounds here, that would be a claim nobody can support.

Reducing the appearance of expression wrinkles

Clinical trial

The cosmetic use, and the only one studied.

EvidenceSmall studies report roughly 10 to 30% reduction in wrinkle depth over four to eight weeks, measured by skin topography. Several are industry-funded and none is large.

Replacing botulinum toxin injections

Published review

What the marketing implies.

EvidenceNo study has compared argireline with botulinum toxin head to head. The magnitude of effect reported in the topical studies is far below what injection produces.

Identity and clearance

Molecule

Class: Acetylated hexapeptide, SNAP-25 mimetic
Molecular weight: 888.98 Da
Length: 6 amino acids

Sequence

Ac-Glu-Glu-Met-Gln-Arg-Arg-NH2

At about 889 daltons it is well above the rough 500-dalton threshold for easy passage through intact skin, which is the central practical limitation.

Dose protocols reported in sources

Displayed for reference only. Every row says where it came from, and a trial protocol and a community convention are not the same kind of information. None of this is fed into the calculator, and none of it is a recommendation.

Dose protocols reported in sources, with the source of each.
Goal	Dose	Frequency	Route	Units	Source	Start this protocol
Concentration used in the published studies	25 mg – 50 mg	Applied twice daily	TopicalStudies used formulations of roughly 5% to 10% argireline, applied morning and evening. The figures here are the peptide content of a single half-millilitre application at those concentrations. It is not a dose in the sense the rest of this site uses, because almost none of it crosses the skin. What matters for a topical is the concentration and the vehicle, not the milligrams you spread on your face.	—	Clinical trial	Start this

Start this copies a row into a protocol of your own, which you can then edit. Where a source gave a dose range or an ambiguous frequency, those fields arrive empty — we will not pick a number on your behalf.

Safety

Reported effects

Mild skin irritation or rednessClinical trial
Uncommon
Usually attributable to other ingredients in the formulation rather than to the peptide.
Contact dermatitisPublished review
Rare
Systemic effectsPublished review
Not expected
Meaningful systemic absorption through intact skin is unlikely for a peptide this size. The same barrier that limits its cosmetic effect also limits the risk.

When to stop

Persistent redness, itching or burning where it is applied.
Any rash spreading beyond the application area.
Swelling of the eyelids or around the eyes.
Any sign the product itself has spoiled: separation, colour change or smell.

Interactions and situations that need care

Broken, irritated or freshly treated skinUse caution
Applying anything to compromised skin bypasses the barrier that normally limits both absorption and irritation, which changes the risk from negligible to unpredictable.
Application close to the eyeUse caution
Crow's feet are the target and the eye is next to them. Cosmetic serums are not formulated as ophthalmic products, and contamination of a home-mixed serum makes this more than a theoretical concern.
Pregnancy and breastfeedingUnknown
No specific safety data exists. Systemic absorption is expected to be minimal, which is a reason for reassurance, not a study. The honest position is that nobody has looked.
Mixing your own serum from raw powderUse caution
A finished cosmetic contains a preservative system for a reason. A home mix has none — will grow bacteria within days to weeks — and is applied to the face near the eyes.

What to expect

The effect is real and it is small: roughly 10 to 30% reduction in wrinkle depth in the studies, over weeks, on expression lines.
It is not comparable to botulinum toxin. Same protein complex, vastly different mechanism and magnitude, and no head-to-head study exists.
How much reaches the muscle at all is the open question. The peptide is well above the size that passes easily through intact skin.
The formulation matters more than the percentage on the label. A high concentration in a poor vehicle delivers nothing.
It is among the lowest-risk compounds covered anywhere on this site. Nothing is injected, and the main hazard is a home-mixed serum going bad.

Storage and handling

Freeze-dried powder: Finished serums at room temperature, out of direct sunlight. Raw peptide powder is best refrigerated.
After mixing: A finished cosmetic contains a preservative system and typically lasts 6 to 12 months after opening. A serum mixed at home from raw powder does not have that protection and will grow bacteria. That is the practical risk with this compound, and it is microbiological rather than pharmacological.

Printable one-pager How to reconstitute a vial, step by step

With other peptides

SNAP-8caution
SNAP-8 mimics the same SNAP-25 segment with two extra residues. Using both means competing for one site twice rather than covering two mechanisms.

Check this against a whole stack

Checking your vial

Research chemicals carry no manufacturing standard, so what the vial looks like is often the only quality signal available before you use it. More on assessing quality and COAs.

Clear or lightly tinted serum, consistent in texture
Normal for a finished cosmetic formulation.
Separation, colour change, or any smell
In a topical product these indicate the preservative system has failed. Discard it. Applying a contaminated serum to skin, especially near the eyes, risks infection.
A concentration on the label tells you less than you think
Whether the peptide penetrates depends on the formulation around it. A high percentage in a vehicle that does not deliver it is a number rather than an effect.

Questions

Is it really like Botox?: They interfere with the same protein complex, and that is where the resemblance ends. Botulinum toxin is injected into the muscle and enzymatically destroys the target protein; argireline sits on the skin surface and competes with it weakly, if it gets through at all. The published effects are a fraction of what injection produces.
Does a higher percentage work better?: Not reliably. Penetration is the bottleneck, so the vehicle and delivery system matter more than the concentration. A 10% serum in a formulation that does not carry the peptide through the skin will do less than a well-formulated 5% one.
Can I mix my own from raw powder?: You can, and the problem is preservation rather than chemistry. A home mix has no preservative system, will grow bacteria within days to weeks, and is being applied next to your eyes. The saving is not worth that.
How long until I see anything?: The studies measured over four to eight weeks of twice-daily use. Nothing about this is visible in days.

References

Efficacy of a topical acetyl hexapeptide-8 formulation on periorbital wrinkles
International Journal of Cosmetic Science, 2013 · Open and vehicle-controlled cosmetic efficacy studies
Adult volunteers with periorbital expression lines · 5% to 10% argireline solution, applied twice daily · 4 to 8 weeks
Reported reductions in wrinkle depth of roughly 10 to 30% by skin topography measurement. Studies were small and several were industry-funded.
Cosmetic peptides and skin penetration: what topical neuropeptides can and cannot do
Dermatology review literature, 2020 · Review
Humans and in vitro
Notes that penetration through the stratum corneum is the principal limitation for peptides above roughly 500 daltons, that formulation dominates outcome, and that no topical peptide has been compared head to head with botulinum toxin.

Related compounds

SNAP-8

An extended version of Argireline, sold on the same needle-free-Botox premise. Longer peptide, same penetration problem, and less independent evidence.

GHK-Cu

A naturally occurring copper-binding tripeptide with a long history in topical skincare research. Injected use is not what the research studied.

AHK-Cu

GHK-Cu's less-studied sibling, used topically for hair. Almost all the research people cite for it is actually GHK-Cu research.

Melanotan II

A melanocortin agonist that darkens skin by stimulating melanin production. Carries the most serious dermatological concern of anything on this site.

Keep this page honest

If something here is wrong, out of date, or missing a source, tell us and we will fix it and say that we did.

Suggest a correction

This page is educational. It describes what published research reports, not what you should do. Peptides discussed here are largely not approved for human use, and nothing on Bioalmanac is medical advice. No clinician reviews these pages.

Page last updated 16 Aug 2026