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Moumoujus

ALCOHOL DENAT. SD ALCOHOL 37.

Avoid / SOLVENT

ALCOHOL DENAT. (denatured ethanol) functions as a solvent and penetration enhancer, promoting ingredient dissolution and faster absorption. While it contributes to elegant product textures, its potential to disrupt the skin's natural barrier can lead to dryness and irritation.

Summary

solvent penetration enhancer astringent antimicrobial preservative viscosity decreasing

Science

Mechanism of Action

Denatured alcohol operates primarily as a solvent, facilitating the dissolution and uniform distribution of active ingredients within formulations. It enhances the skin's permeability by temporarily disrupting the lipid barrier, thereby allowing other components to penetrate deeper. Additionally, it offers astringent properties for a tightening sensation, acts as an antimicrobial agent to inhibit bacterial growth, and reduces product viscosity for a lightweight, fast-absorbing feel. However, this lipid disruption can strip natural oils, potentially causing dryness, irritation, inflammation, and, over time, a compensatory increase in sebum production.

Research

Clinical Evidence

Medium confidence
Effective range 0.05–12%
Optimal

N/A

Key findings

  1. 01 For similar denatured alcohol types (e.g., SD Alcohol 40-B), minimal irritation was observed in rabbit tests at concentrations as high as 55.65%.
  2. 02 A spray formula containing 12% SD Alcohol 40-B was found to be non-irritating to vaginal mucosa in New Zealand white rabbits.
  3. 03 Human studies demonstrated that gel and spray liquid formulations containing SD Alcohol 40-B at 29% and 12% respectively did not induce photoallergy, dermal sensitization, or phototoxic responses.
  4. 04 The CIR Expert Panel deemed specific denatured alcohol types (SD Alcohols 3-A, 30, 39-B, 39-C, 40-B, 40-C) safe for cosmetic use at concentrations from 0.05% to 12% when denatured with approved agents like t-Butyl Alcohol, Denatonium Benzoate, Diethyl Phthalate, or Methyl Alcohol.

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Water
Optimal pH N/A
0 7 14

Stability

Ethanol is generally stable, though the stability of denatured alcohol can vary depending on the specific denaturants utilized. It serves as an effective solvent, aiding in the creation of cosmetically elegant, fast-absorbing, and lightweight formulations.

Synergies

  • Enhances the penetration and absorption of other active ingredients due to temporary lipid barrier disruption.

Conflicts

  • Ingredients sensitive to drying environments
  • Ingredients whose efficacy or stability is compromised by lipid barrier disruption

Safety

Safety Profile

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

The CIR Expert Panel concluded that specific Alcohol Denat. variants (e.g., SD Alcohols 3-A, 30, 39-B, 39-C, 40-B, 40-C) are safe when denatured with t-Butyl Alcohol, Denatonium Benzoate, Diethyl Phthalate, or Methyl Alcohol, at concentrations between 0.05% and 12%. However, there was insufficient data to support the safety of Alcohol Denat. denatured with Quassin, Brucine, and Brucine Sulfate. The FDA considers ethanol safe for general human health but requires specific approval for drug products where alcohol acts as an active ingredient, citing insufficient long-term safety and efficacy data compared to traditional alternatives.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Avoid

Despite its utility in formulation aesthetics and ingredient penetration, the high irritancy potential and documented mechanism of skin barrier disruption make ALCOHOL DENAT. generally detrimental for long-term skin health.

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