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Definition: Glycerin, also shown as glycerine and glycerol on the ingredient list, is also a humectant. It comes from plant sources, but can also be manufactured synthetically. This underappreciated ingredient appears at the top of many face washes, serums, and moisturizers and is most likely already a feature in your skincare regime.
A 2005 study has shown that glycerin levels correlate with skin hydration levels, so more glycerin means better hydrated skin.