Science
Mechanism of Action
As a key component of the stratum corneum's lipid matrix, Ceramide AS precisely fills intercellular gaps, creating a robust seal. This action critically prevents excessive transepidermal water loss (TEWL), thereby maintaining optimal skin hydration. Concurrently, it acts as a protective shield against environmental irritants, pathogens, and allergens, while also contributing to balanced oil production and exhibiting anti-inflammatory benefits.
Research
Clinical Evidence
High confidenceFrom 0.1% to 2.0%. Concentrations of 0.1-0.5% are ideal for extremely sensitive or compromised skin, while 1-2% is effective for more resilient skin requiring intensive barrier repair.
Key findings
- 01 Clinical data indicates that ceramide concentrations ranging from 0.1% to 2.0% deliver optimal outcomes for sensitive skin without inducing irritation. Specific tailoring of concentration, from 0.1-0.5% for highly sensitive skin to 1-2% for intensive barrier repair on resilient skin, is recommended.
- 02 A 4-week study involving a ceramide-containing moisturizer demonstrated a significant 38% increase in skin water content and a 10% increase in stratum corneum ceramide content, leading to resolved dry skin symptoms and reduced discomfort.
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Ceramide AS maintains structural integrity within a precise pH range of 4.5 to 6.5, though stability may extend up to 7.5. Deviation to highly acidic or alkaline conditions can compromise its structure; notably, alkaline pH can disrupt natural ceramide synthesis within the skin. As a lipophilic ingredient, Ceramide AS necessitates dispersion within oil phases or emulsions, with its inherent poor solubility in both water and oil improvable through the judicious use of nonionic surfactants and liquid polyhydric alcohols. For optimal incorporation, it should be added to formulations at temperatures not exceeding 40°C, though dissolving ceramide powders in a compatible oil at 80-90°C prior to emulsion incorporation is sometimes required. Incomplete dissolution can render the ingredient ineffective for barrier repair.
Conflicts
- highly acidic environments (below 4.5 pH)
- highly alkaline environments (above 6.5-7.5 pH)
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has deemed ceramides, including Ceramide AS, safe for use in cosmetic applications, provided they are not sourced from bovine central nervous system tissues. Comprehensive toxicological data, including studies on toxicokinetics, repeated dose toxicity, genotoxicity, carcinogenicity, reproductive and developmental toxicity, irritation, and sensitization, were not identified in the published literature reviewed by CIR in 2014. The SCCS did not provide specific opinions or data for Ceramide AS during the CIR review period, further indicating its generally recognized safety profile.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Ceramide AS is an essential lipid for robust skin barrier function, offering superior hydration, protection, and anti-inflammatory benefits across all skin types.
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