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Glossary 

# Moisturizer

MOYS-chur-eye-zur 

## Definition

A moisturizer is a skincare product designed to hydrate the skin and prevent water loss by combining three types of moisturizing ingredients: humectants (which attract water), emollients (which smooth and soften by filling gaps between skin cells), and occlusives (which form a protective seal over the skin to lock moisture in). A well-formulated moisturizer typically contains all three types to provide complete hydration. Moisturizers come in various formats — lightweight lotions and gels for oily skin, richer creams for dry skin, and heavy ointments for very dry or compromised skin. Key ingredients to look for include ceramides, hyaluronic acid, glycerin, niacinamide, squalane, and shea butter. Moisturizing is an essential step for all skin types, including oily skin, as it supports barrier function, prevents transepidermal water loss, and creates a healthy foundation for other skincare products.

## Related Terms

[Humectant](/glossary/humectant)[Emollient](/glossary/emollient)[Occlusives](/glossary/occlusives)[Barrier Function](/glossary/barrier-function)[Ceramides](/glossary/ceramides)

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