Science
Mechanism of Action
This amino acid derivative targets several key pathways to enhance skin vitality and protection. It strengthens the skin barrier by promoting ceramide synthesis, specifically by upregulating SPTLC1 expression, which in turn minimizes transepidermal water loss (TEWL) and boosts hydration. Its anti-aging efficacy is attributed to stimulating collagen production and potently inhibiting the formation of Advanced Glycation End-products (AGEs), thereby preventing dermal stiffening and discoloration. Furthermore, Acetyl Hydroxyproline exhibits antioxidant activity by scavenging free radicals and offers anti-inflammatory effects that can alleviate pruritus (itching).
Research
Clinical Evidence
High confidence1%
Key findings
- 01 In a 4-week study on subjects with slight atopic dermatitis, this concentration effectively prevented an increase in transepidermal water loss (TEWL) and alleviated pruritus, indicating significant barrier repair and soothing benefits.
- 02 A cell-free assay demonstrated that this concentration inhibited Advanced Glycation End-product (AGE) formation by 80%, highlighting its potent anti-aging potential against glycation.
- 03 In three-dimensional cultured skin models, both concentrations effectively increased ceramide synthesis through the upregulation of SPTLC1 expression, confirming its role in barrier strengthening.
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Acetyl Hydroxyproline is stable within a pH range of 4.0 to 10.0. Formulations should avoid temperatures exceeding 40°C. If a 1% solution in water results in a highly acidic pH (1.4-2.5), it requires adjustment to the optimal operating range (4.0-10.0) for stability and efficacy.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel concluded that amino acid alkyl amides, including Acetyl Hydroxyproline, are safe for use in current cosmetic practices and concentrations, provided formulations are non-irritating. Clinical evaluations, including an under-eye treatment containing 2% Acetyl Hydroxyproline, showed no ocular irritation potential. No cytotoxicity was observed in 3D skin models at concentrations of 1 or 3 mg/mL, and no adverse effects were reported in clinical trials utilizing 1% (w/w) Acetyl Hydroxyproline.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Acetyl Hydroxyproline is a valuable ingredient for comprehensive skin health, offering significant benefits in barrier repair, anti-aging, and soothing properties, making it suitable for a wide range of skin types.
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