Science
Mechanism of Action
Kaolin functions primarily as an absorbent, meticulously drawing out excess sebum and environmental impurities from the skin's surface. This action leads to a discernible mattifying effect and significantly aids in preventing clogged pores. Beyond absorption, it offers gentle physical exfoliation by helping to lift away dead skin cells, contributing to a smoother texture. The ingredient also possesses inherent soothing properties, which can help to mitigate inflammation and reduce visible redness, making it beneficial for delicate skin. Additionally, Kaolin serves as a bulking agent, improves formula texture as an anticaking agent, acts as a cosmetic colorant (imparting a white hue), and provides opacifying qualities. Its light-diffusing capacity may also contribute to a subtle reduction in the appearance of fine lines and wrinkles.
Research
Clinical Evidence
High confidenceNo single optimal percentage is universally defined, but concentrations ranging from 4% to 40% are recognized by the FDA as an OTC skin protectant. It is used up to 100% in general skincare preparations.
Key findings
- 01 CIR Safety Assessment of Naturally-Sourced Clays supporting its use in skincare for absorbent, bulking, and opacifying properties.
- 02 FDA registration as an OTC skin protectant drug (Category I) at 4-40% concentration for specific claims.
Transparency
Dusting Analysis
As a solid particle, CI 77004, particularly in powder or spray formulations, presents a risk of inhalation. Formulations must be precisely engineered to minimize airborne particles to prevent potential pulmonary irritation or damage.
The Formula
Formulation
Stability
CI 77004 is characterized by its insolubility in both water and oil, meaning it integrates into formulations as a suspension rather than dissolving. It demonstrates remarkable stability across a broad pH spectrum, typically presenting a neutral pH, with specific observed ranges from approximately 5 (for a 5% USP grade solution) to 7.60-8.20.
Conflicts
- Direct contact with eyes should be rigorously avoided due to the potential for irritation from its solid particulate form.
- In higher concentrations, especially within leave-on products, it may induce dryness in individuals with certain skin types.
- Formulations, particularly those dispensed as sprays or powders, must be meticulously designed to minimize inhalation exposure to prevent potential pulmonary concerns.
Safety
Safety Profile
The CIR Expert Panel has concluded CI 77004 to be safe for cosmetic use, provided it is formulated to be non-irritating. While generally well-tolerated on the skin, its solid particle nature necessitates careful formulation to prevent eye irritation or inhalation, particularly in aerosolized products. The SCCS has evaluated aluminum compounds, which are components of kaolin, establishing safe concentration limits for aluminum in specific product categories (e.g., up to 6.25% in non-spray deodorants/antiperspirants). In the US, while not approved as a colorant, Kaolin is recognized by the FDA as an OTC skin protectant at 4-40% concentrations when such claims are made.
Your Skin
Skin Compatibility
Our Assessment
Verdict
CI 77004 is a highly versatile and well-tolerated ingredient, offering significant benefits for skin clarification, mattification, and gentle exfoliation across all skin types, with a strong safety profile.
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