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Moumoujus

ALCOHOL DENAT. SD ALCOHOL 38-B.

Questionable / SOLVENT

Alcohol Denat., encompassing forms like SD Alcohol 38-B, is a denatured ethanol frequently employed in skincare as a solvent and penetration enhancer. While it offers astringent, antimicrobial benefits and contributes to lightweight product textures, its application demands precision due to its potential for skin irritation and its 'icky' INCIDecoder rating. Moumoujus advocates for careful formulation within strict concentration limits to mitigate adverse effects.

Summary

antimicrobial/antibacterial solvent viscosity controlling astringent antifoaming masking preservative penetration enhancer

Science

Mechanism of Action

Alcohol Denat. primarily functions as a solvent, enabling the dissolution of ingredients not soluble in water or oil. On the skin, it acts as an astringent, providing a temporary tightening sensation, and serves as an effective antimicrobial agent against surface bacteria. It also enhances the transdermal penetration of other active ingredients, optimizes product viscosity, acts as an antifoaming agent, and contributes to preservation, ultimately yielding fast-absorbing, cosmetically elegant formulations.

Research

Clinical Evidence

Medium confidence
Effective range 0.05–12%
Optimal

N/A

Key findings

  1. 01 An irritation test of SD Alcohol 40-B (denatured with Denatonium Benzoate) on rabbits showed minimal effects at 55.65%.
  2. 02 A spray formula containing 12% SD Alcohol 40-B was non-irritating to vaginal mucosa in rabbits and did not induce photoallergy, dermal sensitization, or phototoxic responses in human subjects.
  3. 03 A gel formula with 29% SD Alcohol 40-B did not induce photoallergy, dermal sensitization, or phototoxic responses in human subjects.
  4. 04 A 2005 study indicated that adding emollients to alcohol-based hand rubs could potentially reduce skin irritation.

Transparency

Dusting Analysis

Not commonly dusted

Alcohol Denat. serves as a solvent, preservative, and functional ingredient, rather than a filler. Its inclusion is based on its specific functional properties within a formulation, not to dilute or 'dust' around other active compounds.

The Formula

Formulation

Solubility
Both
Optimal pH N/A
0 7 14

Synergies

  • Co-formulation with emollients has shown potential to reduce skin irritation associated with alcohol-based products.

Safety

Safety Profile

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

The Cosmetic Ingredient Review (CIR) Expert Panel considers Alcohol Denat. safe for cosmetic use up to 12% concentration, provided it is denatured with approved substances such as t-Butyl Alcohol, Diethyl Phthalate, or Methyl Alcohol. SD Alcohol 40-B denatured with Denatonium Benzoate has sufficient supporting safety data. However, the safety of Alcohol Denat. denatured with Quassin, Brucine, and Brucine Sulfate lacks adequate data. The FDA has not conclusively demonstrated the long-term safety or superior efficacy of alcohol in consumer antiseptic washes compared to traditional soap and water.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Questionable

Despite its functional roles as a solvent and antimicrobial, Alcohol Denat. carries an 'icky' INCIDecoder rating and medium irritancy potential, making its use in precision skincare questionable and necessitating meticulous formulation within established safe concentration limits.

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