Encyclopedia · other
Kaolin
A soft white clay used in matte clays, pastes and dry shampoos to soak up oil and give a dry, textured finish.
What it is
Kaolin is a naturally mined aluminium silicate clay. In hair products it acts as an absorbent and bulking agent, which are the main cosmetic functions the safety panel lists for naturally sourced clays (Burnett 2026). In "matte clay" pomades it is mixed with waxes. See styling products explained.
How it works
Fine mineral particles adsorb sebum and add friction between hairs, which gives grip and a flat, non-glossy surface. No hair-specific measurement was found. This is generic adsorption and formulation logic.
What the studies show
- A safety review of silicate clays including kaolin found they are not significantly toxic when swallowed. Inhalation toxicity is easily shown in animals and depends on particle size, concentration and composition (Elmore 2003).
- A 2026 amended review of 8 naturally sourced clays judged kaolin safe as used. For the other 7, data were insufficient for products that might be incidentally inhaled (Burnett 2026).
- No trial of kaolin on hair look or hold exists, so performance claims are manufacturer-level.
How it's used in studies
Not applicable.
Side effects and safety
On skin it is considered safe as used. The concern is inhalation, so do not puff dry shampoos and powders near your face. Clay-heavy products can leave a dry, dusty feel and are hard to wash out without a clarifying shampoo.
Bottom line
Fine for matte, textured styling and oil absorption. It is not a hair-health ingredient. We are moderately confident about safety and not about performance claims.
Studies 2
Elmore AR; CIR Expert Panel. Final report on the safety assessment of aluminum silicate, calcium silicate, magnesium aluminum silicate, bentonite, kaolin and related clays. Int J Toxicol. 2003
Result: Not significantly toxic orally in short-term animal tests; inhalation toxicity is readily shown in animals and depends on particle size, concentration and composition.
Read the study ↗Burnett CL et al. Amended Safety Assessment of Naturally-Sourced Clays as Used in Cosmetics. Int J Toxicol. 2026
Tested: 8 naturally sourced clays
Result: Kaolin judged safe as used; the other clays safe except that data were insufficient for products that may be incidentally inhaled.
Read the study ↗Related
- BentoniteA swelling clay used in clay masks and some matte styling products as an absorbent and thickener; "bentonite washes" are untested for hair.
- Silica silylateWater-repelling fumed silica used in texturising powders, sprays and pastes for grip, a dry feel and oil absorption.
- BeeswaxThe classic hold-and-grip wax in pomades and braiding waxes; harmless for most people but a documented contact allergen for a minority.
- Styling products explainedStyling products come down to how much hold and how much shine you want; there are almost no head-to-head trials, so this page combines formulation knowledge with the few things that have been measured.