According to Healthline, propylene glycol is a syrupy liquid that is thicker than water. It is odorless, colorless, and often used in food and drinks to add a little oomph of flavor or as a preservative. It was initially derived from petroleum products by using fossil fuels, which isn't great for the environment, but now they can make synthetic propylene glycol from sugar cane, vegetable oils, and corn, per Mind Body Green.
This version of propylene glycol is definitely the way to go. Clean cosmetic chemist Krupa Koestline told the outlet, "It has all the great properties of its petroleum-derived cousin, as well as preservative-boosting capabilities that are great in any formulation." This clear liquid is used as a solvent and is also a great humectant. Propylene glycol, specially made for skincare products, is used in creams and serums (via Byrdie). However, the one derived from petroleum is not.
Why This Previously Banished Skincare Ingredient Is Making A Comeback - The List
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