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Moumoujus

N-STEAROYL-DIHYDROSPHINGOSINE.

Valuable CAS - / SKIN CONDITIONING

N-STEAROYL-DIHYDROSPHINGOSINE, commonly known as Ceramide NP, is a vital lipid that inherently strengthens the skin's protective barrier. This ceramide derivative is instrumental in enhancing the skin's capacity for moisture retention and defense against external stressors.

Summary

Skin conditioning Hair conditioning Barrier repair and reinforcement Moisture retention Anti-inflammatory Improves the appearance of dry and/or damaged skin by reducing flaking and restoring its suppleness

Science

Mechanism of Action

This ingredient functions by directly integrating into the stratum corneum's lipid matrix, acting as the 'mortar' that binds skin cells together. It forms a water-tight, nearly impermeable lipid film, which significantly reduces trans-epidermal water loss (TEWL) and prevents the intrusion of harmful substances. Beyond barrier reinforcement, it also modulates inflammatory responses and regulates cell proliferation, contributing to overall skin homeostasis and specifically inhibiting allergic cytokines like IL-4 and TNF-alpha.

Research

Clinical Evidence

High confidence
Effective range 0.01–3%
Optimal

0.1%

Key findings

  1. 01 Demonstrated measurable improvements in skin barrier function.
  2. 02 Recommended for therapeutic efficacy in barrier repair, particularly for compromised skin.
  3. 03 Facilitated rapid recovery of distressed skin post-tape stripping and enhanced skin resilience over two weeks.
  4. 04 Improved skin hydration levels in mature skin.

Transparency

Dusting Analysis

Not commonly dusted
Min. effective
0.01%
Red flag below
0.1%

While measurable improvements are observed at 0.01%, concentrations below 0.1% may be insufficient for achieving robust therapeutic claims in barrier repair, especially for compromised skin. Products containing less than 0.01% are unlikely to offer significant benefits and may be considered 'dusted.'

The Formula

Formulation

Solubility
Oil
Optimal pH 5 – 7
0 7 14

Stability

Optimal stability is maintained within a pH range of 5.0-7.0. Exposure to acidic conditions below pH 4.5 can lead to amide bond hydrolysis, especially at elevated temperatures. The ingredient is also susceptible to oxidation, hydrolysis, and degradation from environmental factors such as temperature, humidity, and light; therefore, appropriate antioxidant systems are crucial for formulation integrity.

Conflicts

  • Acidic conditions (pH <4.5)
  • Lack of adequate antioxidant systems (leads to oxidation)
  • Certain cationic polymers (can cause phase separation)
  • Inadequate solubilization (can lead to crystallization upon cooling)
  • Ionic and non-ionic surfactants (can disrupt the lipid barrier's orthorhombic packing)

Safety

Safety Profile

CIR Status
Safe as used
Max tested
5%
Sensitization risk Low

The Cosmetic Ingredient Review (CIR) Expert Panel has affirmed its safety in cosmetic formulations. Dermatological studies demonstrate excellent tolerance, with no reported sensitization, phototoxicity, or comedogenicity up to 5% concentration. The FDA has noted a maximum use concentration of 0.2% for Ceramide 3 (synonymous) in specific products like lipstick and face/neck skincare preparations.

Your Skin

Skin Compatibility

Yes Normal
Yes Dry
Yes Oily
Yes Sensitive
Irritancy Low
Comedogenicity Low

Our Assessment

Verdict

Valuable

N-STEAROYL-DIHYDROSPHINGOSINE is a highly valuable ingredient for its proven ability to restore and reinforce the skin's lipid barrier, leading to enhanced hydration and resilience across all skin types.

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