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Moumoujus

ACTIVATED CLAY.

Valuable / ABSORBENT, BULKING

Activated clay, encompassing varieties like kaolin and bentonite, is a natural mineral lauded for its significant adsorptive capacity, effectively drawing out impurities, excess sebum, and environmental pollutants from the skin. It acts as a gentle cleanser and mild exfoliant, aiding in skin renewal and promoting a more balanced, clearer complexion across all skin types.

Summary

Absorbent Exfoliant Cleansing Viscosity Controlling Sebum Regulating Skin Purifying Barrier Enhancing Antibacterial

Science

Mechanism of Action

Activated clay primarily functions via adsorption, utilizing its porous structure and expansive surface area to attract and bind impurities, excess oils, and toxins on the skin's surface. Bentonite clay, upon hydration, develops a mild negative charge, magnetically pulling positively charged substances like sebum and debris; as it dries, it physically tightens and lifts these elements away. Kaolin clay contributes by gently cleansing the skin without stripping essential oils, while its fine texture offers mild exfoliation, supporting skin cell turnover and preventing pore blockages. Clays can also form a protective film and may exhibit antibacterial properties.

Research

Clinical Evidence

Medium confidence
Effective range N/A
Optimal

N/A

Key findings

  1. 01 A 4-week clinical study involving a clay mask containing kaolin and bentonite demonstrated significant improvements in acne-related outcomes, sebum content, skin evenness, and hydration for individuals with oily and acne-prone skin. Participants reported 100% oil control effectiveness within 1 week.
  2. 02 Daily topical application of clay to rat skin over 7 days was observed to increase the number of collagen fibers by approximately 19% (51.74% ± 1.28% versus 43.39% ± 1.79% in control skin).

Transparency

Dusting Analysis

Not commonly dusted

While precise minimum effective concentrations for all benefits are not extensively documented, activated clay's primary mechanisms of adsorption and physical exfoliation typically necessitate its inclusion at notable percentages to deliver visible efficacy. Use at very low concentrations may not contribute meaningfully to product performance.

The Formula

Formulation

Solubility
Water
Optimal pH 4.5 – 6.5
0 7 14

Stability

Cosmetic-grade kaolin is compatible with the skin's natural barrier due to its slightly acidic to neutral pH (4.5–6.5). Successful formulations require clays to meet stringent chemical (stability, purity, inertness) and physical (texture, particle size, pH compatibility) specifications, with fine granulometry being essential for cosmetic applications. Certain clays, such as bentonite, can induce rapid thickening upon hydration.

Conflicts

  • Industrial-grade clays (due to coarse particles, potential heavy metal contamination including lead, arsenic, cadmium, mercury, and microbial contaminants)
  • Ingredients whose efficacy relies on remaining on the skin surface, as highly adsorptive properties of clay may bind and reduce their bioavailability

Safety

Safety Profile

CIR Status
Safe as used
Max tested
Maximum reported safe concentrations include 16% for kaolin in leave-on dermal formulations and 8% for bentonite in face and neck formulations.%
Sensitization risk Low

The Cosmetic Ingredient Review (CIR) has affirmed the safety of cosmetic-grade kaolin and bentonite clays when used appropriately. However, robust purification treatments and characterization tests are crucial for cosmetic-grade clays to ensure microbiological safety and the absence of heavy metal contamination. The FDA has issued warnings regarding certain unpurified bentonite clay products found to contain elevated lead levels. While generally considered low irritancy, one subject in a study of a clay mask containing 14.5% kaolin experienced moderate erythema and edema with papules, indicating potential for irritation in specific individuals or at certain concentrations.

Your Skin

Skin Compatibility

Yes Normal
Yes Dry
Yes Oily
Yes Sensitive
Irritancy Low
Comedogenicity Low

Our Assessment

Verdict

Valuable

Activated Clay is a valuable ingredient for purifying and rebalancing skin, particularly beneficial for oily and acne-prone types, provided it is sourced as cosmetic-grade and properly purified.

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