Science
Mechanism of Action
As a surfactant, Stearamide DEA primarily functions to modify the physical properties of formulations. It boosts and stabilizes foam in cleansing products, while also acting as a viscosity-increasing agent in aqueous systems. Its opacifying properties reduce product transparency for visual appeal. Additionally, it aids in dispersing, emulsifying, and solubilizing other ingredients, contributing to improved texture and spreadability.
Research
Clinical Evidence
Low confidenceN/A
Key findings
- 01 The available research predominantly focuses on the safety and irritation potential of Stearamide DEA and related compounds, rather than direct efficacy for specific skin benefits. Studies on rabbits using 35-40% concentrations of Stearamide DEA indicated no skin or ocular irritation.
- 02 Clinical studies on related ingredients such as Stearamide MEA at 5.27% and Stearamide DIBA-Stearate (1.3% diluted to 4%) demonstrated no sensitization in human patch tests, with the latter showing only mild irritation but confirming non-sensitizing properties and non-comedogenicity.
Transparency
Dusting Analysis
Stearamide DEA is a functional formulation ingredient, not typically marketed for direct skincare benefits. Its primary roles are to enhance product texture, stability, and sensory attributes (like foam), rather than to deliver active dermatological effects. Therefore, the concept of 'dusting' regarding exaggerated skin efficacy claims is not applicable to this ingredient.
The Formula
Formulation
Stability
A 1% aqueous dispersion of Stearamide DEA typically exhibits a pH range of 9.0 to 10.0. This ingredient, part of the fatty acid diethanolamide family, is stable within neutral, moderately alkaline, or moderately acidic environments. However, it is susceptible to hydrolysis when exposed to high concentrations of mineral acids or strong alkalis.
Conflicts
- Nitrosating systems (risk of carcinogenic N-nitroso compound formation)
- High concentrations of mineral acids or alkali (can induce hydrolysis)
- Nitrite-containing containers (to prevent nitrosamine formation)
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel deems Stearamide DEA safe for rinse-off products. For leave-on applications, it is considered safe at concentrations up to 40%, provided that the release of free ethanolamines is limited to 5%. Regulatory guidelines, including those from the EU Cosmetics Regulation (Annex III), impose further restrictions, such as a maximum secondary amine content of 0.5% in the finished product and 5% in the raw material, and a nitrosamine content limit of 50 µg/kg. Products containing Stearamide DEA must not be used with nitrosating systems or stored in nitrite-containing containers to prevent the formation of N-nitroso compounds. The FDA does not advise alarm regarding its use but encourages consumers to review ingredient lists if they wish to avoid DEA-related compounds.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Stearamide DEA is a functional ingredient primarily valued for its role in enhancing product texture, foam, and stability, with extensive safety data supporting its use under specific formulation restrictions to ensure consumer safety.
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