Science
Mechanism of Action
This ingredient functions as a cellular messenger (KTTKS sequence) that instructs fibroblasts to synthesize essential structural components including Type I, III, and IV collagen and glycosaminoglycans. Simultaneously, its caffeoyl moiety acts as a biological shield, neutralising UV-induced oxidative stress and inhibiting Matrix Metalloproteinase-1 (MMP-1), the enzyme responsible for collagen degradation.
Research
Clinical Evidence
High confidence0.0003%
Key findings
- 01 Comparative trials indicate that a 3 ppm (0.0003%) concentration delivers anti-wrinkle efficacy comparable to 0.07% retinol but with significantly improved skin tolerability.
- 02 In vitro studies on human skin fibroblasts at 10-50 µM concentrations demonstrated a marked increase in Type I collagen production and a decrease in collagen-thinning enzymes.
Transparency
Dusting Analysis
Because this peptide is biologically active at incredibly low parts-per-million (ppm), many brands include it at 'trace' levels for label claims without reaching the 3 ppm threshold required to match retinol-like performance.
The Formula
Formulation
Stability
The caffeoyl conjugation enhances the peptide's oxidative stability, though the molecule remains sensitive to extreme pH levels which can trigger hydrolysis.
Synergies
- Hyaluronic Acid
- Niacinamide
- Other signaling peptides
- Non-acidic antioxidants
Conflicts
- Strong Alpha Hydroxy Acids (Low pH)
- L-Ascorbic Acid
- Proteolytic enzymes
- Strong oxidizing agents
Safety
Safety Profile
While the caffeoyl derivative is modern, its parent peptide (Pentapeptide-4) has been thoroughly vetted by the CIR as safe for leave-on cosmetic use.
Your Skin
Skin Compatibility
Our Assessment
Verdict
An elite signaling peptide for sensitive skin types seeking retinol-level results in collagen density and wrinkle reduction without the irritation.
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References
Sources