Cosmetic Ingredient
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- • Humectant (282)
- • Hydrotrope (92)
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- • Skin Humectant (21)
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- • Smoothing (32)
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- • Tonics (155)
- • UV Filter (34)
- • Viscosity Controlling (532)
Chemicals as Skincare Ingredients
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Skin Humectant
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More Information
The moisture content of the stratum corneum must be maintained between 10% and 30%. Below 10% can lead to dry skin conditions, while above 30% can result in excessive hydration, both of which are detrimental to the health of the stratum corneum.
The principles of moisturizing products are the same, including four basic principles: occlusion, humectants, hydrophilic matrix, and photoprotection. Occlusion involves trapping moisture in the skin, creating an environment conducive to barrier repair. Humectants are substances that can absorb water like sponges. Hydrophilic matrix is a protective film covering the outside of the stratum corneum to reduce water evaporation. Photoprotection involves adding active ingredients, such as antioxidants and sunscreens, to moisturizing products.
Common humectants include:
•Glycerin
•Sodium lactate
•Urea
•Propylene glycol
Frequently Asked Questions
A skin humectant is a type of moisturizing ingredient that attracts water from the environment and deeper layers of the skin to the outer layer (stratum corneum), helping to keep the skin hydrated. Common examples include glycerin, hyaluronic acid, and sorbitol. Humectants are essential in skincare formulations for maintaining skin softness, elasticity, and barrier function.
Some of the most effective and widely used humectants in skincare include hyaluronic acid (known for holding up to 1,000 times its weight in water), glycerin (a gentle and cost-effective option), propylene glycol, and sodium PCA. These ingredients are valued for their ability to improve hydration without clogging pores or causing irritation when properly formulated.
Yes, in very dry or low-humidity conditions, humectants may draw moisture from the deeper layers of the skin rather than the air, potentially leading to dehydration if not paired with occlusive or emollient ingredients. To prevent this, skincare products often combine humectants with occlusives like dimethicone or shea butter to seal in moisture effectively.
When selecting skincare products with humectants, look for formulations that also include emollients and occlusives to lock in moisture. Check the ingredient list for proven humectants like hyaluronic acid, glycerin, or panthenol. Additionally, consider your skin type—sensitive skin may benefit from fragrance-free, hypoallergenic products with minimal irritants.
Many natural humectants—such as honey, aloe vera, and glycerin derived from plant sources—are highly effective and well-tolerated by most skin types. However, effectiveness depends more on concentration, formulation stability, and compatibility with other ingredients than on whether the source is natural or synthetic. Both types can deliver excellent hydration when properly integrated into a skincare product.