Science
Mechanism of Action
Functioning as a cosmetic astringent, SD Alcohol 39-A effectively constricts dilated pores and reduces surface oil. It serves as a potent solvent, dissolving and dispersing a range of ingredients including surfactants, oils, and dyes, and can also modify product viscosity. The ethanol component facilitates deeper absorption of other active ingredients and exhibits intrinsic antibacterial properties. However, its application can lead to excessive skin dryness, disruption of the epidermal barrier, depletion of vital lipids, and may provoke inflammation, potentially resulting in increased sebaceous activity over time.
Research
Clinical Evidence
Low confidenceN/A
Key findings
- 01 Ethanol concentrations up to 70% demonstrated no significant inflammatory changes after 100 applications over 14 days when compared to water in a study published in the Journal of Occupational Medicine and Toxicology.
- 02 The Cosmetic Ingredient Review (CIR) Expert Panel determined that certain other denatured alcohols are safe for use between 0.05% to 12% concentration; however, this specific finding does not extend to SD Alcohol 39-A due to its unique denaturant profile.
Transparency
Dusting Analysis
Given the 'insufficient data' conclusion by the CIR Expert Panel regarding the safety of SD Alcohol 39-A, coupled with its high irritancy potential and known capacity to disrupt the skin barrier and deplete healthy lipids, it is considered a red flag ingredient. Moumoujus prioritizes skin health and safety, making ingredients with such unresolved safety profiles and potential detrimental effects on skin integrity unsuitable for our precision formulations.
The Formula
Formulation
Stability
SD Alcohol 39-A typically exists as a clear, colorless liquid, demonstrating stability under normal storage conditions. It is flammable and naturally resistant to microbial growth, thereby imparting preservative qualities to cosmetic formulations.
Conflicts
- Prolonged or excessive usage can interfere with the skin's natural barrier function and dissolve healthy lipids, potentially leading to dryness and irritation.
- Might conflict with cosmetic claims such as 'phthalate-free' if other similar SD alcohols contain denaturants like diethyl phthalate, although SD Alcohol 39-A's specific denaturants (t-butyl alcohol and quinine/cinchonidine salts) do not.
Safety
Safety Profile
The CIR Expert Panel concluded there was insufficient data to support the safety of SD Alcohol 39-A, specifically due to its denaturants: t-butyl alcohol combined with quinine, quinine bisulfate, quinine dihydrochloride, cinchonidine, or cinchonidine sulfate or their salts. While general ethanol is approved by the FDA as a Category I OTC drug for healthcare antiseptic purposes at 60-95% concentrations, this designation does not apply to denatured alcohols like SD Alcohol 39-A in cosmetic contexts.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Despite its functional roles as a solvent and astringent, SD Alcohol 39-A carries a 'high' irritancy rating and an 'insufficient data' safety status from the CIR Expert Panel, making its inclusion questionable for formulations committed to preserving skin barrier integrity and long-term dermatological health.
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References
Sources