Propylene glycol (C3H8O2; CAS no. 57-55-6) is a chemical compound, usually a tasteless, odorless, and colorless clear oily liquid that is hygroscopic and miscible with water.
Propylene glycol is used:
- as a moisturizer to absorb maintain moisture in medicines, cosmetics, and food products,
- as a solvent for food colors,
- as a carrier in fragrance oils,
- as a food grade antifreeze and in deicing solutions
- to make artificial smoke for use in firefighters' training and theatrical productions,
- in hand sanitizers, antibacterial lotions,
- as a main ingredient in many cosmetic products, including baby wipes, bubble baths , and shampoos.
Safety
The Food and Drug Administration (FDA) has determined propylene glycol to be "generally recognized as safe" for use in food, cosmetics, and medicines. Similar to ethylene glycol, propylene glycol affects the body's chemistry by increasing the amount of acid, potentially resulting in metabolic problems. However, larger amounts of the substance are needed to cause this effect. Eating or drinking very large amounts can result in death, while large amounts can result in nausea, convulsions, slurred speech, disorientation, and heart and kidney problems. Propylene glycol is considerably less toxic than ethylene glycol.
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