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ALCOHOL DENAT..

Questionable CAS 64-17-5 / ANTIFOAMING, ANTIMICROBIAL, ASTRINGENT, FRAGRANCE, SOLVENT, VISCOSITY CONTROLLING

Alcohol Denat. is a versatile ingredient functioning as a solvent and astringent. While it imparts a rapid-drying texture and can boost the penetration of other actives, its capacity to dissolve natural skin oils demands judicious formulation to prevent barrier disruption.

Summary

Antimicrobial/Antibacterial Solvent Viscosity Controlling Astringent Antifoaming Agent Penetration Enhancer

Science

Mechanism of Action

This compound acts as a solvent, antifoaming agent, cosmetic astringent, and viscosity-decreasing agent, while also possessing antimicrobial properties. Its rapid evaporation facilitates a quick-drying, lightweight, and non-greasy feel in products. Crucially, it enhances the absorption of beneficial ingredients like vitamin C and retinol, though this mechanism can involve stripping the skin's natural oils, potentially leading to dehydration and weakening of the epidermal barrier.

Research

Clinical Evidence

Medium confidence
Effective range 0.05–12%
Optimal

N/A

Key findings

  1. 01 The CIR Expert Panel found specific denatured alcohol types (e.g., denatured with t-Butyl Alcohol, Denatonium Benzoate) safe for cosmetic use within this range.
  2. 02 Demonstrated minimal irritation effects in rabbit dermal irritation tests.
  3. 03 Evaluated in human subjects, these concentrations did not induce photoallergy, dermal sensitization, or phototoxic responses.
  4. 04 A 2005 study indicated that incorporating emollients into alcohol-based formulations might reduce skin irritation.

Transparency

Dusting Analysis

Commonly dusted
Min. effective
12%
Red flag below
12%

Alcohol Denat. is frequently 'dusted' due to widespread consumer apprehension, often amplified by its 'icky' rating on platforms like INCIDecoder. This perception often overlooks scientific findings that deem specific denatured types safe at concentrations up to 12% for cosmetic formulations. However, concentrations exceeding this threshold, particularly in leave-on products or for sensitive skin, could signify a higher risk of irritation and barrier damage.

The Formula

Formulation

Solubility
Both
Optimal pH N/A
0 7 14

Stability

Ethanol, the primary component, is stable and effectively functions as a preservative by inhibiting microbial proliferation, thereby enhancing product shelf-life and integrity.

Synergies

  • Vitamin C
  • Retinol
  • Emollients (to mitigate irritation)

Safety

Safety Profile

CIR Status
Safe with restrictions
Max tested
12%
Sensitization risk Low

The CIR Expert Panel has affirmed the safety of specific Alcohol Denat. types (e.g., denatured with t-Butyl Alcohol, Denatonium Benzoate) within concentrations of 0.05% to 12%. However, data remains insufficient for the safety assessment of denatured alcohols containing Quassin, Brucine, or Brucine Sulfate. The FDA recognizes its safety in OTC cosmetic products, including sunscreens, within regulated limits, but has expressed reservations regarding its long-term daily use in consumer antiseptic washes.

Your Skin

Skin Compatibility

No Normal
No Dry
Yes Oily
No Sensitive
Irritancy Medium
Comedogenicity Medium

Our Assessment

Verdict

Questionable

While Alcohol Denat. provides functional benefits like enhanced active delivery and a quick-drying feel, its moderate irritancy and comedogenicity, coupled with its potential to compromise the skin barrier at higher concentrations, necessitates its use only in meticulously formulated products for appropriate skin types.

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