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Moumoujus

ACETYL HEXAPEPTIDE-8.

Questionable CAS 616204-22-9 / HUMECTANT, SKIN CONDITIONING

Acetyl Hexapeptide-8, also known as Argireline, is a biomimetic peptide engineered to specifically target and reduce the appearance of dynamic wrinkles. It offers a topical, non-invasive approach to achieve a smoother complexion by moderating facial muscle contractions.

Summary

Anti-aging Muscle contraction modulator Skin conditioning Humectant Hydrating Elasticity enhancer Scar treatment agent Sebum regulator

Science

Mechanism of Action

This peptide functions by interfering with the SNARE complex, a critical protein structure involved in the release of neurotransmitters. Mimicking the N-terminal fragment of SNAP-25, Acetyl Hexapeptide-8 modulates neurotransmitter secretion, specifically acetylcholine. By inhibiting these chemical signals, it reduces the intensity and frequency of facial muscle contractions, thereby softening expression lines and wrinkles over time.

Research

Clinical Evidence

Medium confidence
Effective range 3–10%
Optimal

5%

Key findings

  1. 01 Demonstrated a 17% reduction in wrinkle depth around the eyes over 15 days.
  2. 02 Resulted in a 16.26% decrease in wrinkle depth after 28 days of use.
  3. 03 Observed to significantly enhance skin moisturization and reduce both the depth and width of wrinkles, alongside potential benefits in skin elasticity, scar remodeling, and sebum regulation.

Transparency

Dusting Analysis

Commonly dusted
Min. effective
0.005%
Red flag below
3%

While several clinical studies indicate significant anti-aging benefits, particularly in reducing expression lines, at concentrations ranging from 3% to 10%, the Cosmetic Ingredient Review (CIR) Expert Panel has determined Acetyl Hexapeptide-8 to be safe for use in leave-on cosmetic formulations only up to 0.005%. This profound disparity between effective and safe concentrations strongly suggests a potential for 'dusting', where the ingredient is included at a level far below its studied efficacy for marketing claims.

The Formula

Formulation

Solubility
Water
Optimal pH 6 – 7
0 7 14

Stability

As a hydrophilic peptide, Acetyl Hexapeptide-8 exhibits optimal stability within a pH range of 6.0 to 7.0. Although stable in this range, studies indicate that its permeability through the skin is notably higher in acidic environments (e.g., pH 2.7) compared to alkaline conditions (e.g., pH 7.4), a crucial factor for formulation design to maximize delivery.

Conflicts

  • Glycolic Acid
  • Salicylic Acid
  • Kojic Acid
  • Parabens

Safety

Safety Profile

CIR Status
Safe with restrictions
Max tested
0.005%
Sensitization risk Low

The CIR Expert Panel concluded Acetyl Hexapeptide-8 is safe at concentrations up to 0.005% in leave-on cosmetic products, noting insufficient data for evaluating safety at higher concentrations. Concerns regarding systemic toxicity and genotoxicity were mitigated by its peptide structure, low log Ko/w, and the limited maximum use concentration. This ingredient is not listed as restricted or prohibited by the European Union and is not recognized as a drug by the FDA in the US.

Your Skin

Skin Compatibility

Yes Normal
Yes Dry
Yes Oily
Yes Sensitive
Irritancy Low
Comedogenicity Low

Our Assessment

Verdict

Questionable

While Acetyl Hexapeptide-8 shows compelling efficacy in reducing expression lines and improving skin hydration at concentrations typically between 3-10% in research, its safe use is restricted by CIR to a maximum of 0.005%, rendering its practical effectiveness in compliant formulations highly questionable.

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