A guide to the most studied hydrating ingredients and how they work.
Topic
Skin Barrier & Hydration
Difficulty
Intermediate
Reading Time
6 min
Last Updated
2026-07-07
Sections
2
References
2 sources
Word Count
92 words
Entities
10 detected
Internal Links
3 articles
What is Key Hydrating Ingredients?
A guide to the most studied hydrating ingredients and how they work.
umectants
Hyaluronic acid, glycerin, and panthenol draw water into the skin. They are the core of hydration and work best when layered under a moisturizer that seals them in.
mollients and Occlusives
Ceramides, squalane, and fatty acids are emollients that smooth and soften. Occlusives like petrolatum and dimethicone form a barrier that prevents water loss. A good moisturizer often combines all three categories.
Water content in the skin. Delivered by humectants and sealed by occlusives for comfortable, plump skin.
The outermost protective layer of skin that retains moisture and limits irritant entry.
A humectant that holds many times its weight in water, plumping and hydrating the skin surface.
Lipids naturally found in the skin barrier that help retain moisture. Levels decline with age and harsh cleansing.
A humectant that draws water into the skin. One of the most common and effective hydrating ingredients.
An emollient that smooths and softens skin. Lightweight and suitable for most skin types.
A humectant and emollient that also supports barrier repair and soothing.
The process of water evaporating through the skin barrier. Excessive TEWL indicates barrier compromise.
A class of ingredients that attract and bind water to the skin. Examples: hyaluronic acid, glycerin.
A class of ingredients that form a barrier to prevent water evaporation. Examples: petrolatum, dimethicone.
Hyaluronic acid, glycerin, and panthenol draw water into the skin. They are the core of hydration and work best when layered under a moisturizer that seals them in.
Ceramides, squalane, and fatty acids are emollients that smooth and soften. Occlusives like petrolatum and dimethicone form a barrier that prevents water loss. A good moisturizer often combines all three categories.
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