The most popular moisture carrying vehicle used in cosmetic formulations is propylene glycol after water. It has greater skin permeation than glycerin and has a more comfortable feel with less greasiness. Since it attracts water from the air, propylene glycol is used as a humectant. It is also a solvent for antioxidants and preservatives. When used in higher concentrations, it also has antibacterial and antifungal properties.

See also:
Humectants