Propylene Glycol (PG)

Propylene glycol (or PG) is a clear, slightly syrupy liquid made by the reaction of propylene oxide with water. PG has had an unsurpassed reputation for safe use in a wide range of consumer products and has antibacterial properties. PG is used to keep many foods that we eat moist, and the FDA has deemed it safe for human consumption. It’s used in many drinks, including beers. It’s also present in the manufacturing process of several types of cookies, cakes and candies. Because of its water-retaining properties, propylene glycol is the compound of choice for delivering atomized medications. It has been used in asthma inhalers and nebulizers since the 1950s! In electronic cigarettes and personal vaporizers, PG allows atomization to occur at substantially lower temperatures, and also helps to deliver the nicotine when inhaled.

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