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On heating, cbd products propylene glycol and polyethylene glycol can produce carbonyls. These, including acetaldehyde, formaldehyde, and acrolein, cbd hemp extract may be toxic to the user. In a 2017 study by the Medical Marijuana Research Institute, researchers heated and tested these carrier liquids, cbd edibles shop along with MCTs and vegetable glycerine, cbd edibles shop for carbonyls. The study found propylene glycol produced high levels of acetaldehyde and cbd edibles shop formaldehyde when researchers heated them, cbd edibles shop compared to MCT and cbd edibles shop vegetable glycerin. Acrolein production was similar for all substances. The study also found that MCTs produced a small amount of acetaldehyde
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