Alcohol Denat.

What it does

In cosmetics it behaves like plain alcohol: a fast-evaporating solvent and astringent that dissolves hard-to-mix ingredients and gives products a lightweight, quick-drying feel. It is a formulation aid, not a skin treatment.

Benefits

• Excellent solvent for components that won't dissolve in water or oil
• Creates thin, fast-absorbing, cosmetically elegant formulas, including lightweight sunscreens and sprays
• Strong astringent that gives a refreshing, tightening sensation, popular in toners and aftershaves
• Has mild disinfecting and preservative-boosting properties

Side effects

• Drying with frequent use; can strip the skin and may trigger compensatory oil production over time
• Can sting or irritate sensitive or compromised skin, especially when high on the ingredient list
• Some experts argue regular exposure may damage the skin barrier and cause inflammation, though this is contested

Who it's for

Oily or combination skin that enjoys a fast-drying, matte, non-greasy feel, and formulas that need it as a quick-evaporating carrier