Humectant
Definition
A humectant is a type of moisturizing ingredient that attracts and binds water molecules from the environment and from deeper layers of the skin, drawing moisture into the stratum corneum. Common humectants include hyaluronic acid, glycerin, urea, aloe vera, honey, panthenol (provitamin B5), and propylene glycol. Humectants are lightweight and particularly beneficial for dehydrated and oily skin types because they provide hydration without heaviness or greasiness. However, in very dry environments with low humidity, humectants can actually pull moisture from the deeper layers of the skin rather than the air, potentially increasing dryness. For this reason, it is recommended to layer humectants with emollients and occlusives to lock in the moisture they attract. This combination approach provides the most complete and lasting hydration.
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