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Propylene glycol, also known as propane-1,2-diol, is a synthetic alcohol which can be also synthesized from natural sources. It has a sweetish taste and flavour, and is safe to consume in smaller amounts. It is a common ingredient in food & drinks, cosmetics, hand soaps, liquid medicines, and more. It has a cousin called propanediol, which is also known as propane-1,3-diol, and it is more naturally abundant than propane-1,2-diol. Both propylene glycol and propanediol are technically edible, unlike the glycols called ethylene/diethylene glycol.
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