Propylene glycol: Moisture carrying agent used in cosmetics, an “industrial anti-freeze” that prevents things from drying out, normally used in brake and hydraulic fluid, paint, floor wax. Found in deodorants, suntan lotions, lipsticks, shampoos, skin creams, and other cosmetics. It can cause dermatitis, kidney damage and liver abnormalities, can inhibit cell growth in human tests and can damage membranes causing rashes, dry skin and surface damage. Avoid it and instead choose alternative products containing glycerin or sorbitol.