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T-BUTYL ALCOHOL.

Valuable CAS 75-65-0 / DENATURANT, PERFUMING, SOLVENT

T-Butyl Alcohol is a functional ingredient widely used in precision skincare for its capabilities as a solvent, denaturant, and subtle fragrance component. It also acts as a powerful antioxidant and stabilizer, crucial for preserving formula integrity and enhancing product texture, ensuring active components remain stable and effective.

Summary

Denaturant Fragrance Ingredient Solvent Antioxidant Formula Stabilizer Texture Enhancer Hydroxyl Radical Scavenger

Science

Mechanism of Action

This ingredient functions in multiple capacities within cosmetic formulations. Primarily, it serves as a denaturant and solvent, aiding in the dissolution of other components and making products unsuitable for ingestion. It contributes to a product's overall fragrance profile. Beyond these roles, T-Butyl Alcohol acts as a reliable antioxidant, actively protecting formulations from oxidation that can compromise their color, odor, and texture, thereby safeguarding the stability and efficacy of sensitive ingredients. It can also improve the sensorial experience, contributing to a lighter, less greasy feel and promoting uniform distribution on skin or hair. Additionally, it has been noted for its potential moisturizing properties and its ability to scavenge hydroxyl radicals.

Research

Clinical Evidence

High confidence
Effective range 0.00001–0.91%
Optimal

0.91%

Key findings

  1. 01 Reported across 32 formulations including eye makeup, fragrances, and shaving preparations in 1998, demonstrating broad applicability.
  2. 02 Represents the highest reported maximum concentration of use in aftershave lotions, based on a 2022 survey, indicating its functional efficacy at this level.
  3. 03 Maximum reported use concentration in products contacting mucous membranes, such as lipsticks, as of 2023, showcasing its utility in sensitive areas.

Transparency

Dusting Analysis

Not commonly dusted

T-Butyl Alcohol is primarily valued for its functional contributions to formulation stability and texture rather than being promoted as a primary skin-benefiting active ingredient. It is not typically subject to 'dusting' or over-marketing.

The Formula

Formulation

Solubility
Water
Optimal pH N/A
0 7 14

Stability

T-Butyl Alcohol enhances the stability of cosmetic products by acting as an antioxidant, effectively protecting formulations from oxidative degradation. This action also helps to ensure various components remain well-mixed and maintain desired consistency.

Conflicts

  • Oxidizing materials

Safety

Safety Profile

CIR Status
Safe as used
Max tested
0.91%
Sensitization risk Low

The Cosmetic Ingredient Review (CIR) Expert Panel has consistently affirmed the safety of T-Butyl Alcohol for use in cosmetics under current practices and concentrations, a conclusion reaffirmed through multiple amended reports up to 2024. The highest reported cosmetic use concentration is 0.91% in aftershave lotions. It is also listed by the FDA as an indirect food additive and approved for use as an alcohol denaturant. Its application in cosmetics adheres to the general provisions of the EU Cosmetics Regulation.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Valuable

T-Butyl Alcohol is a valuable functional ingredient that significantly enhances formulation stability, acts as an effective solvent, and contributes to overall product aesthetics and integrity within established safe use concentrations.

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