Science
Mechanism of Action
Ceramides constitute approximately 50% of the stratum corneum's lipid matrix, the skin's outermost layer. Ceramide 4 reinforces epidermal integrity by forming a cohesive barrier that minimizes transepidermal water loss (TEWL), thereby preventing dehydration. Beyond its protective and hydrating roles, ceramides are implicated in cellular processes such as cell recognition, growth, proliferation, and differentiation, potentially contributing to the delay of skin aging.
Research
Clinical Evidence
Medium confidenceN/A
Key findings
- 01 A moisturizer containing a 4% ceramide complex, which included Ceramide 4, demonstrated effectiveness in restoring and repairing the skin's barrier, providing up to 24 hours of moisturization, and improving skin oxygenation.
- 02 An ointment formulated with a blend of ceramides, including Ceramide 4, was clinically evaluated and found to lack comedogenic potential.
- 03 General ceramide-containing products, not specific to Ceramide 4, enhanced skin penetration and improved the absorption rate, depth, and amount in a clinical trial involving 20 healthy individuals with dry skin.
Transparency
Dusting Analysis
Due to the INCI name 'Ceramide 4' being retired and a previous 'not in use' status in 2014, insufficient data is available from regulatory surveys to establish a specific maximum use concentration or dusting threshold for Ceramide 4 alone.
The Formula
Formulation
Stability
Ceramides exhibit optimal stability within a pH range of 4.5 to 6.5; exposure to highly acidic (below 4.5) or alkaline (above 6.5) environments can lead to structural degradation. They are heat-sensitive and susceptible to re-crystallization or degradation when exposed to light. For most forms, incorporation into formulations should occur at temperatures below 40°C. If utilizing ceramide powder, initial dispersion in a compatible oil phase may require heating the oils to 80-90°C prior to final formulation, with encapsulated ceramide forms generally offering enhanced stability.
Conflicts
- Highly acidic environments (pH below 4.5)
- Highly alkaline environments (pH above 6.5)
- High heat (above 40°C during typical incorporation; initial powder dispersion in hot oil is an exception)
- Exposure to light
Safety
Safety Profile
The INCI name 'Ceramide 4' was officially retired in 2014 and is now designated as 'Ceramide AS'. A 2014 CIR report indicated 'Ceramide 4' as 'not in use' based on available data, meaning specific maximum use concentrations for Ceramide 4 individually were not established. However, the CIR Expert Panel generally concludes that ceramide ingredients are 'safe as used', provided they are not derived from bovine central nervous system tissues.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Ceramide 4 is a valuable skin-identical lipid fundamental for bolstering the skin's barrier function and enhancing moisture retention, making it a beneficial ingredient in diverse skincare formulations.
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