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Preservatives
Some products contain preservatives, in order to stop the active ingredients from going off. While the term ‘preservatives’ may make you think of harmful chemicals, these are necessary because of how delicate skincare formulations can be, and also to prevent bacteria from thriving.
The high water content, especially in hydrating skincare products, could be a perfect breeding ground for bacteria, and Propylene Glycol is a preservative that’s particularly effective against microbes and unwanted microorganisms.