Science
Mechanism of Action
TETRA(T-BUTOXYCARBONYL) ACETYL HEXAPEPTIDE-8 AMIDE BIS(METHYL ESTER) functions by mimicking the N-terminus of SNAP-25, a critical protein involved in neurotransmitter release. By integrating into the SNARE ternary complex, it inhibits the Ca2+-dependent exocytosis of acetylcholine into the neuromuscular junction. This action leads to a temporary, localized relaxation of facial muscles, similar to the effects of Botulinum neurotoxin type A, thereby diminishing fine lines and wrinkles resulting from repetitive facial movements. Beyond its muscle-relaxing properties, this peptide also exhibits humectant capabilities, enhancing skin moisturization and supporting barrier function. Preliminary research further suggests its potential to stimulate collagen synthesis and assist in sebum regulation.
Research
Clinical Evidence
High confidenceN/A
Key findings
- 01 Decreased wrinkle depth around the eyes by 17% after 15 days of use.
- 02 Decreased wrinkle depth by 16.26% after 28 days of use.
- 03 Decreased the depth of skin wrinkles by 20% by day 15 and by 30% by day 30 when used in an oil-in-water emulsion (human study with 8 subjects).
- 04 Increased skin moisturization and significantly decreased both the depth and width of wrinkles.
Transparency
Dusting Analysis
Clinical studies demonstrating significant wrinkle reduction typically utilize concentrations ranging from 5% to 10%. However, the Cosmetic Ingredient Review (CIR) Expert Panel has concluded that Acetyl Hexapeptide-8 Amide (and its synonyms, which this ingredient is derived from) is safe only at concentrations up to 0.005%. This creates a substantial discrepancy, indicating that products claiming high efficacy based on the higher study concentrations are operating significantly above the recognized safe usage limits. Consumers should be aware of this disparity when evaluating product claims.
The Formula
Formulation
Stability
While the general technical profile suggests an optimal pH range of 6.0-7.0 for stability, an in vitro study indicated that skin permeability was markedly higher in an acidic environment (pH 2.7) compared to an alkaline one (pH 7.4). This suggests a potential trade-off between formulation stability and enhanced skin delivery at lower pH.
Safety
Safety Profile
The CIR Expert Panel deemed Acetyl Hexapeptide-8 Amide (and its synonym Acetyl Hexapeptide-8) safe for cosmetic use at concentrations up to 0.005%. Data were insufficient to assess safety at higher concentrations, with further studies on type I and type III collagen synthesis (NOAEL) required for elevated usage levels. This ingredient is not listed on the European Union's restricted or prohibited substance lists for cosmetics.
Your Skin
Skin Compatibility
Our Assessment
Verdict
While studies indicate significant anti-wrinkle efficacy at concentrations of 5-10%, regulatory bodies like CIR only deem Acetyl Hexapeptide-8 safe up to 0.005%, posing a significant challenge for effective and safe formulation within established guidelines.
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