Science
Mechanism of Action
This ingredient functions by creating a vapor-permeable film on the skin's surface, which helps to condition and soften the skin. Its inherently low surface tension promotes excellent spreading, allowing formulations to glide on effortlessly. Furthermore, it aids in formulation stability as a solvent and an anti-caking agent.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
As a silicone, Cycloheptasiloxane generally exhibits robust stability in cosmetic formulations. However, extreme pH environments, particularly highly acidic (e.g., pH 4) or highly alkaline (e.g., pH 9) conditions, have been shown to reduce the hydrolytic stability of similar cyclic siloxanes compared to neutral pH 7. It is insoluble in water but readily dissolves in common organic solvents such as alcohols, ethers, and hydrocarbons.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has deemed Cycloheptasiloxane, grouped with other cyclomethicones, safe for use at current concentrations in cosmetic practices. Its minimal percutaneous absorption indicates a low likelihood of skin irritation or sensitization. European scientific committees (SCCS) have also concluded that related cyclomethicones (D4, D5) do not pose a risk to human health at reported cosmetic concentrations. This ingredient is not listed by the FDA as a prohibited or restricted cosmetic component.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Cycloheptasiloxane is a valuable silicone for its versatile skin conditioning, emollient properties, and textural enhancement capabilities, complemented by its low irritancy and comedogenicity across all skin types.
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References
Sources