Science
Mechanism of Action
This ingredient operates through a dual mechanism. The PEG-15 Stearate portion, typical of PEG Stearates, acts as a non-ionic emulsifier, creating stable mixtures of oil and water phases in a product. It also functions as a humectant by drawing moisture from the environment to the skin, and as an emollient to impart a soft, smooth feel. The DEDM Hydantoin segment, a formaldehyde-releasing preservative, actively prevents the proliferation of bacteria, fungi, and mold, thereby extending the product's shelf life.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
This ingredient is a known formaldehyde-releasing preservative. Formaldehyde and formaldehyde-releasers are often 'dusted' in the clean beauty space due to their potential to cause skin irritation and allergic reactions, particularly in sensitive individuals. The red flag percentage refers to the maximum regulatory limits for related formaldehyde-releasing preservatives in certain regions, indicating a concentration that should not be exceeded.
The Formula
Formulation
Stability
The PEG Stearate component demonstrates stability across moderately strong acidic, alkaline, and electrolytic conditions. The DEDM Hydantoin component, similar to DMDM Hydantoin, maintains stability when exposed to light, heat, and variations in pH, performing optimally within a pH range of 3-10. For best stability and to prevent decomposition, it should be incorporated into formulations during the cooling phase, ensuring temperatures do not exceed 60°C (140°F).
Conflicts
- strong oxidizing agents
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel deemed PEG Stearates, including PEG-15 Stearate, as safe for cosmetic use within current practices. Similarly, DMDM Hydantoin, a closely related formaldehyde-releasing preservative, was found 'safe as used' by the CIR. However, PEG-15 DEDM Hydantoin Stearate is a formaldehyde donor, a substance recognized by the FDA as a potential allergen. This can lead to skin irritation and allergic reactions in an estimated 8-9% of the U.S. population, particularly sensitive individuals. Caution is advised, especially if used in inhalable forms, due to potential respiratory concerns.
Your Skin
Skin Compatibility
Our Assessment
Verdict
While effective as an emulsifier and preservative, its nature as a formaldehyde-releaser presents a high risk of sensitization and irritation for a significant portion of the population, leading to a questionable rating for precision skincare formulations.
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