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What Is Propylene Glycol?

One of the ingredients used in making e liquid is (Pharmaceutical Grade) Propylene Glycol. Both the FDA and The World Health Organisation considers Pharmaceutical Grade PG (Propylene Glycol) safe for humans. 

Propylene Glycol Studies
When propylene glycol is injected, it is metabolized in the human body into pyruvic acid (a normal part of the glucose-metabolism process, readily converted to energy), acetic acid (handled by ethanol-metabolism), lactic acid (a normal acid generally abundant during digestion)] , and propionaldehyde. Because of its low chronic oral toxicity, propylene glycol was classified by the U. S. Food and Drug Administration as “generally recognized as safe” (GRAS) for use as a direct food additive.

Propylene glycol is a clear, colorless, slightly syrupy liquid at room temperature. It may exist in air in the form of vapour, propylene glycol must be heated or briskly shaken to produce a vapor

- Propylene glycol is practically odorless and tasteless

- Propylene glycol is a chemical made by reaction of propylene oxide with water

- Propylene glycol has had an unsurpassed reputation for safe use in a wide range of consumer products, including food products, animal feed, cosmetics and pharmaceuticals, as well as industrial applications