What it is
Alcohol Denat. is the general name used for denatured alcohol, which is the alcohol found in alcoholic beverages to which a small amount of a denaturant (generally a bittering agent) is added to make it taste bad.
What it does
Alcohol Denat. is used in cosmetic products as an antifoaming agent either to suppress foam during manufacturing or to reduce the tendency of finished products to generate foam.
It is also a preservative, functioning as an antimicrobial agent.
It is also used as an astringent, solvent and viscosity decreasing agent.
Alcohol denat is a very drying and irritating solvent.
It also is a dehydrator as it strips your skin’s moisture and natural immune barrier, making you more vulnerable to bacteria, moulds and viruses.