WHAT IS IT? Propylene glycol is an antifreeze solvent commonly found in brake and hydraulic fluid, paint, floor wax, pet food and tobacco. It also shows up as a humectant (supposedly a moisturizer) in almost every mainstream deodorant, shaving gel, conditioner, shampoo, toothpaste, face cream, baby wipe and cosmetic product.

HEALTH RISK: Propylene glycol has been shown to cause dermatitis, kidney and liver damage and can also inhibit skin cell growth. It can be absorbed by the skin and is stored throughout the body.