A moisturizer, or emollient, is a cosmetic preparation used for protecting, moisturizing, and lubricating the skin. These functions are normally performed by sebum produced by healthy skin. The word "emollient" is derived from the Latin verb mollire, to soften.

Mechanism of action

In the human body, water constantly evaporates from the deeper layers of the skin through an effect known as transepidermal water loss.

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