Science
Mechanism of Action
As a metallic soap, it forms a crystalline lattice within oil phases, effectively increasing viscosity and generating a gel-like texture. On skin, it helps stabilize emulsions, uniformly suspend particles like pigments or UV filters, and provides an elegant, velvet-like finish.
Research
Clinical Evidence
Low confidenceN/A
Key findings
- 01 Product formulations containing 2.5-2.85% Isostearic acid showed no contact sensitization in repeat insult patch tests on 333 subjects.
- 02 Undiluted Isostearic acid (100%) caused no irritation; Aluminum Stearate (structurally similar) demonstrated low acute dermal toxicity in guinea pig studies.
Transparency
Dusting Analysis
The Formula
Formulation
Stability
It exhibits high stability against heat and mechanical stress, with a melting point of approximately 115-120°C. While insoluble in water, it readily disperses in oils and various organic solvents.
Conflicts
- Hot mineral acids (e.g., sulfuric, nitric) which cause decomposition into isostearic acid and aluminum salts
- Strong oxidizing agents
Safety
Safety Profile
The CIR Expert Panel deemed it safe for use in current practices, with concentrations up to 24% reported in eye makeup. It should be formulated to be non-irritating and non-sensitizing to ensure optimal safety.
Your Skin
Skin Compatibility
Our Assessment
Verdict
As a versatile, low-risk functional ingredient, it is valuable for enhancing product texture, stability, and aesthetic appeal across various skincare formulations.
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References
Sources