Alcohols are safe to use in skincare. They are used for many different purposes to serve in skincare formulation.
Alcohol prevents from the formula from growing bacteria, fungus, etc. This helps to extend the shelf life.
2. Makes the formula lighter
Products with alcohols tend to give you the lightweight feeling, leaving not a lot of grease on top of the skin.
3. Penetrating enhancer
Alcohol itself is an excellent penetrating enhancer. It helps the penetration process of the active ingredients. However, because it can't selectively enhance, it could enhance unwanted ingredients. Make sure to use products that suit your skin.