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SD ALCOHOL 39-C.

Valuable / ASTRINGENT, SOLVENT, VISCOSITY CONTROLLING

SD Alcohol 39-C is a versatile cosmetic ingredient primarily functioning as a solvent and viscosity control agent. It helps products spread evenly and absorb quickly while also serving as an astringent to manage excess oil on the skin. This ingredient further provides preservative benefits to formulations.

Summary

Solvent Astringent Viscosity Control Agent Preservative

Science

Mechanism of Action

Within cosmetic formulations, SD Alcohol 39-C acts as a solvent, efficiently dissolving and dispersing diverse ingredients such as surfactants, oils, dyes, and bactericidal preservatives. It also serves as a viscosity control agent, optimizing product consistency for stability and controlled dosage. On the skin, it induces a temporary contraction of stratum corneum cells, leading to a visible tightening of dilated pores and effective removal of superfluous oil. This mechanism facilitates enhanced product spreadability, rapid absorption, and can augment the penetration of other active ingredients by removing surface lipids.

Research

Clinical Evidence

Low confidence
Effective range N/A
Optimal

N/A

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Both
Optimal pH N/A
0 7 14

Stability

SD Alcohol 39-C exhibits a neutral pH and maintains stability under standard storage conditions. Due to its flammable nature, appropriate handling and storage precautions are required.

Synergies

  • Enhances the dermal penetration of other active ingredients by temporarily solubilizing skin surface oils.

Conflicts

  • High concentrations have the potential to disrupt the skin's natural lipid barrier, leading to dryness and irritation.
  • Requires careful consideration when formulated with other potential irritants, such as certain fragrance components, as it can increase their skin penetration and thus amplify irritation risk.

Safety

Safety Profile

CIR Status
Safe as used
Sensitization risk Low

The Cosmetic Ingredient Review (CIR) Expert Panel, with participation from the U.S. Food & Drug Administration, concluded in 2008 that SD Alcohol 39-C, denatured with Diethyl Phthalate, is 'safe as used' in cosmetic formulations. The denaturant itself was reaffirmed safe for topical application in 2005. This safety assessment is based on typical 'as used' concentrations in products, implying safe usage within these parameters. While deemed safe under normal use, excessive concentrations may lead to undesirable effects such as skin dryness and irritation due to lipid removal.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Valuable

SD Alcohol 39-C is a valuable multi-functional ingredient that significantly contributes to formulation efficacy, particularly beneficial for managing oily skin, provided it is incorporated within appropriate concentration limits.

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