Humectant

Glycereth-18

Reviewed by Emma · Last updated 18 Aug 2026

Synthetic, glycerin-based ingredient

What Is Glycereth-18?

Glycereth-18 is a synthetic glycerin-based ingredient used as a humectant (hydration-boosting agent) in skin care and other cosmetics formulations. It also functions as a skin-conditioning (moisturizing) agent.\n\nIn 2021, the independent Cosmetic Ingredient Review Expert Panel deemed glycereth-18 safe as it is used in cosmetics. Their report looked at products using glycereth-18 in concentrations up to 0.32% maximum.

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