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ALCOHOL DENAT. SD ALCOHOL 31-A.

Questionable / SOLVENT

Alcohol Denat., specifically SD Alcohol 31-A, is a multifaceted ingredient employed in precision skincare formulations. Valued for its solvent properties, rapid evaporation, and ability to enhance active ingredient penetration, it also serves as an astringent and antimicrobial agent. However, its usage requires careful consideration due to its potential to disrupt the skin's natural lipid barrier, particularly for individuals with dry or sensitive skin.

Summary

Antimicrobial/antibacterial Solvent Viscosity controlling Astringent Antifoaming Masking Penetration enhancer Quick-drying agent Preservative

Science

Mechanism of Action

This compound primarily functions as a potent solvent, dissolving hydrophobic ingredients and enhancing formula stability. Its high volatility promotes quick drying, contributing to lightweight product textures. Acting as an astringent, it can temporarily minimize the appearance of pores and reduce surface oil. Crucially, it serves as a penetration enhancer, modifying the skin's permeability to facilitate deeper absorption of other beneficial compounds. Additionally, it exhibits antimicrobial efficacy, contributing to product preservation and surface hygiene. Nonetheless, its mechanism includes stripping natural skin lipids, which may lead to dryness and compromise barrier integrity.

Research

Clinical Evidence

Medium confidence
Effective range 12–29%
Optimal

N/A

Transparency

Dusting Analysis

Not commonly dusted

Alcohol Denat. is a liquid ingredient and is not associated with dusting.

The Formula

Formulation

Solubility
Both
Optimal pH N/A
0 7 14

Stability

Alcohol Denat. is highly volatile, contributing to quick-drying formulas. Its intrinsic antimicrobial properties also function as a preservative, enhancing product shelf life.

Synergies

  • Enhances penetration of other active ingredients.
  • Acts as a solvent to integrate various formulation components.

Conflicts

  • Can strip natural oils from the skin, leading to dryness and potential barrier disruption.
  • Not ideal for dry or sensitive skin types due to potential irritation and weakening of the skin barrier.
  • High concentrations or regular exposure may cause inflammation and damage the skin barrier.

Safety

Safety Profile

CIR Status
Not explicitly reviewed for SD Alcohol 31-A. However, the CIR Expert Panel concluded that 'Alcohol Denat.' and several other 'SD Alcohol' types (e.g., 3-A, 30, 39-B, 39-C, 40-B, 40-C) are safe when denatured with specific agents like t-Butyl Alcohol, Denatonium Benzoate, Diethyl Phthalate, or Methyl Alcohol. Data was insufficient for denaturants such as Quassin, Brucine, and Brucine Sulfate.
Max tested
12%
Sensitization risk Low

While generally considered safe in small cosmetic concentrations (0.05% to 12%), higher concentrations (e.g., 29%) have been tested as non-irritating or non-sensitizing in specific formulations and denatured alcohol types. The FDA distinguishes between 'alcohol' (ethyl alcohol) and 'denatured alcohol' for cosmetic labeling. The SCCS notes a low risk of acute poisoning from cosmetic products containing alcohols like ethanol, despite potential harm from ingestion. The specific denaturing agent significantly impacts the safety profile.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Questionable

While effective as a solvent, penetration enhancer, and antimicrobial for specific formulations, its 'icky' INCIDecoder rating and potential to compromise the skin barrier and cause dryness warrant careful consideration, particularly for dry or sensitive skin types.

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