Propylene Glycol is the primary ingredient in the majority of E-Liquids and E-Cigarette cartridges on the market today. Most E-Liquid contains at least 80% and as much as 92% proplyene glycol.
Propylene Glycol is approved by the FDA for use in various forms. These include items injected, applied topically, and inhaled. Products with Propylene Glycol can be found in various common items around your house. A few examples include:
• Pharmaceuticals – Oral, injectables and topical formulations
• Beauty products including makeup, mousse, shampoo, bubble bath, after shave, and deodorant
• Baby wipes
• Pet food
• Asthma inhalers
When propylene glycol is injected, it is metabolized in the human body into pyruvic acid (a normal part of 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, proplyene glycol was classified by the U.S. Food and Drug Administration as “generally recognized as safe” (GRAS) for use as a direct food additive.