Science
Mechanism of Action
This ingredient operates by creating a thin, hydrophobic yet vapor-permeable film on the skin's outermost layer. This barrier significantly reduces transepidermal water loss (TEWL), thereby enhancing skin hydration and preventing moisture evaporation. It also physically smooths the skin's texture by filling in fine lines and imperfections, contributing to a perceptibly silky finish. Furthermore, this protective film acts as a shield against environmental aggressors and irritants, while maintaining skin breathability and repelling water without being occlusive to bacterial proliferation.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
No specific optimal pH range for the stability of Hydroxypropyl Dimethicone Stearate was found. For a related silicone derivative, PEG-8 Dimethicone, stable formulations are typically observed within a functional pH range of 5.5 to 8.5.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has affirmed the safety of Hydroxypropyldimethicone and related dimethicone/methicone polymers, including this ingredient, for use in cosmetic formulations. This conclusion, reaffirmed in 2021, specifies that ingredients must be formulated to be non-irritating, particularly noting potential ocular irritation at higher concentrations. Due to its large molecular weight, significant skin absorption is considered unlikely. However, the safety of products containing these ingredients when applied via airbrush technology is not supported by sufficient data. While overall cosmetic use of related dimethicone can reach 85% by 2019, the FDA specifically approves Dimethicone as an active ingredient for over-the-counter skin protectants at concentrations ranging from 1% to 30%.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Hydroxypropyl Dimethicone Stearate is a valuable silicone derivative, offering significant benefits in hydration retention, skin smoothing, and barrier protection, making it suitable for all skin types due to its low irritancy and comedogenicity.
Related
Similar Ingredients
Finding similar ingredients…