On heating, propylene glycol and polyethylene glycol can produce carbonyls. These, including acetaldehyde, formaldehyde, and acrolein, may be toxic to the user. In a 2017 study by the Medical Marijuana Research Institute, researchers heated and tested these carrier liquids, along with MCTs and vegetable glycerine, for carbonyls. The study found propylene glycol produced high levels of acetaldehyde and formaldehyde when researchers heated them, compared to MCT and vegetable glycerin. Acrolein production was similar for all substances. The study also found that MCTs produced a small amount of acetaldehyde; about 33 times less than polyethylene glycol. "Because PG (propylene glycol) and PEG 400 (polyethylene glycol) are often mixed with cannabis oil, individuals who vaporize cannabis oil products may risk exposure to harmful formaldehyde levels. Why do we NOT use PG or VG in our
visit TerraPro CBD official site Pen? To learn more about the safety measures we take for our products, read on. Most importantly, there are certain substances we do not use in our CBD oil for safety and health reasons.
