Alcohol Denat.
What is Alcohol Denat.?
SD Alcohol, or Specially Denatured Alcohol, is a type of denatured ethanol used as a solvent and astringent in skincare products. It is ethanol rendered undrinkable by the addition of denaturants, allowing it to evaporate quickly and aid in the delivery of other ingredients. Commonly found in toners, cleansers, and serums, it provides a drying and tightening effect on the skin.
Roles in Formulation
This ingredient serves the following purposes in cosmetic formulations:
Solvent
Dissolves and carries other ingredients, helping control viscosity, evaporation rate, and delivery of actives in both water- and oil-based systems.
Antimicrobial agent
Helps limit growth of bacteria and other microbes on skin or in the formula; may be used for product protection, odor control, or targeted antimicrobial effects.
Denaturant
Makes ethanol undrinkable (for regulatory/tax purposes) and can influence dry-down and sensory feel in alcohol-based sprays, toners, and fragrances.
Preservative
Protects the product from microbial contamination during storage and use, helping maintain safety, stability, and shelf life.