Testing bulk or repackaged glycerin for DEG content is consistent with good manufacturing practice required under the Act.
For other components, such as propylene glycol, that in the past were found to be contaminated with DEG, precautions should also be taken to identify reliable suppliers and secure shipment to prevent similar occurrences.7
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7 The August 2, 1996, CDC Morbidity and Mortality Weekly Report describes DEG-contamination of propylene glycol. The report is available at
CDC - Redirect MMWR Weekly: Past Volumes (1982 - 2009). The TLC test mentioned in recommendation #1 will distinguish DEG from propylene glycol.