Humectants, émollients, occlusifs : comment bien hydrater sa peau ?

19/03/2026

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Camille A.

Humectants, emollients, and occlusive agents? Your cream often contains moisturizing ingredients with very different yet complementary roles. By acting on the flow of water in the skin, on the skin barrier , or on the hydrolipidic film , they help maintain hydrated, supple, and plump skin.

Identifying the main humectants, emollients and occlusive ingredients will help you better choose your skincare and improve the hydration of your skin, whether it is dry, dehydrated, sensitive or even atopic.

In this article, we detail everything you need to know about these moisturizing ingredients.

Skin hydration: the importance of the skin barrier

The natural mechanisms of hydration

Did you know that skin hydration does not depend on the water provided by a product, but rather relies on the balance between different factors¹:

The water contained in the different layers of the skin is subject to flow dynamics (between stratum corneum, epidermis, dermis).
Skin lipids : various fatty substances (ceramides, fatty acids…) which form an intercellular cement and contribute to good cell cohesion, limiting water loss.
The hydrolipidic film: a mixture of sweat and sebum forming a protective layer on the surface of the stratum corneum.

Consequences of a weakened barrier

When the skin barrier is weakened, the skin's insensible water loss (IWL) increases, leading to several problems²:

A feeling of tension
Roughness
Increased sensitivity
A dull complexion

It is precisely to maintain skin hydration and its barrier function that humectants, emollients and occlusives are interesting, each with very specific properties.

The skin provides an essential barrier function for our well-being. Protection, hydration, immunity... discover all the roles of the skin barrier in our comprehensive article .

Humectants

Their role: to attract and retain water

Humectants are moisturizing agents capable of attracting water and retaining it in the stratum corneum.
They act as water reservoirs by helping to maintain a good level of surface hydration³.

Examples of common humectants

Hyaluronic acid

This molecule, naturally present in the skin, is known for its exceptional ability to retain water (up to 1,000 times its weight in water⁵). In cosmetics, it helps maintain good skin hydration, improves suppleness, and contributes to a plump appearance. Depending on its molecular weight, it acts more or less on the surface or deeper within the skin.

Panthenol

Also known as pro-vitamin B5 (or pantothenic acid), it is converted in the skin into vitamin B5, its biologically active form. Once transformed into vitamin B5, it helps to capture and retain water in the stratum corneum, thus contributing to good surface hydration and giving the skin suppleness and comfort. Panthenol also strengthens the skin's barrier function by stimulating keratinocyte renewal. Well-tolerated, it is frequently included in skincare products for dry, reactive, or aggressor skin.

Aloe vera

Aloe vera juice, from a perennial succulent plant, is rich in polysaccharides (mucilage), giving it valuable moisturizing properties. Mucilage helps retain water on the skin's surface, contributing to an immediate feeling of freshness and comfort. Aloe vera is particularly prized in skincare products for sensitive skin or skin exposed to external aggressors.

Urea

Naturally present in the skin's natural moisturizing factor (NMF), urea is an effective humectant. At low concentrations, it helps maintain hydration and improve skin elasticity. At higher concentrations, it can also help smooth rough areas. Its dosage should be adjusted to the skin type to ensure comfort and tolerance.

For which skin types?

Humectants are particularly suitable for:

Dehydrated skin that is unable to retain enough water in its layers.

Skin exposed to climatic variations (wind, cold, heat, ambient temperature variations...) which weaken the skin barrier.
Dull skin, whose lack of water makes the surface uneven and less able to reflect light, which is the source of radiance.
Dehydrated skin appreciates humectants for the suppleness and comfort they provide. However, for complete hydration, it is best to combine them with other moisturizing compounds because, on their own, they are generally insufficient when the skin barrier is compromised.

To learn everything about dehydrated skin and how to take good care of it, check out our dedicated article .

Schéma de l'action et du fonctionnement des émollients

Emollients

Their roles: to strengthen the barrier and to make it more flexible

Skin emollients are compounds that fill the space between cells, at the level of the stratum corneum⁶,⁷.

Overall, they act by:

Strengthening cell cohesion.
Complementing the hydrolipidic film.
Helps restore flexibility.

By compensating for the lipid deficiency, they help reduce feelings of dryness and tightness and soften the skin.

Examples of common emollients

Shea butter

Rich in fatty acids and unsaponifiables, shea butter is a renowned emollient known for its nourishing properties and excellent skin tolerance. It helps strengthen the skin barrier by providing essential lipids and improves skin elasticity. It thus helps reduce feelings of tightness and promotes a softer, more comfortable feel.

Vegetable oils

Like camelina, flaxseed, sweet almond, safflower, olive, and evening primrose oils, these oils are naturally rich in fatty acids and biomimetic lipid compounds (linoleic acid, triglycerides, phytosterols). Plant oils help fill the spaces between the cells of the stratum corneum, thus supporting skin cohesion. Depending on their composition, they help soften the skin, limit dehydration, and improve comfort, all while respecting the skin's natural balance.

Ceramides

These lipids, naturally present in the stratum corneum, play a key role in the organization and effectiveness of the skin barrier. In cosmetics, the application of ceramides helps to support the barrier function, limit transepidermal water loss, and improve the skin's resistance to external aggressors.

Squalane

This moisturizing ingredient is a biomimetic form of squalene, a lipid naturally present in human sebum. Squalane is known for its emollient action, acting as an intercellular cement in the stratum corneum. In skincare formulas, it improves skin elasticity and elasticity, and reduces transepidermal water loss, without being occlusive.

For which skin types?

Emollients are particularly relevant for:

Dry skin that naturally lacks lipids.
Sensitive and atopic skin, characterized by a naturally weakened skin barrier and more highly exposed to factors that stimulate its reactivity.
Mature skin, whose lipid compounds and hydrolipidic film gradually disappear with natural aging.
Infant skin to soften cradle cap.
Overall, emollients restore the skin's lipids, promoting protection, comfort, suppleness and well-being.

Schéma de l'action des ingrédients occlusifs

The plosives

Their role: to limit dehydration

While the term "occlusive" may sound negative, occlusive agents actually offer real benefits for the skin. In practice, they don't deliver water to the skin, but rather they deposit on its surface like a protective barrier that reduces water evaporation, helping to maintain skin hydration and prevent dryness. They are particularly recommended for very dry areas.⁸

Examples of occlusive agents

Waxes

Like beeswax, candelilla wax, and carnauba wax, waxes are substances rich in fatty acid esters. They form a semi-occlusive protective film on the skin's surface, helping to limit transepidermal water loss . By physically reinforcing the skin's surface barrier, they help preserve hydration and protect the skin from external aggressors (cold, wind, friction). They also add texture and comfort to formulas.

Hydrocarbons

Products like petroleum jelly (petrolatum) and paraffin are considered the gold standard occlusives in dermatology. Their inert, highly film-forming structure creates a particularly effective protective barrier on the skin's surface, effectively limiting transepidermal water loss. They are especially popular for restoring and protecting the skin's barrier function , particularly in cases of severe xerosis, atopic dermatitis, or fragile skin. Contrary to popular belief, the hydrocarbons used in dermocosmetics are highly purified. At TOPICREM , we exclusively select pharmaceutical-grade hydrocarbons that meet the strictest safety and purity standards, guaranteeing optimal tolerance, even for sensitive and reactive skin.

Some vegetable butters and oils

Fatty substances like shea butter, cocoa butter, avocado oil, and castor oil offer a dual benefit in dermocosmetics. Rich in fatty acids, they are excellent nourishing emollients, softening the stratum corneum, strengthening corneocyte cohesion, and providing skin comfort. Furthermore, their dense lipid texture also exerts a moderate occlusive action: by forming a protective film on the surface of the epidermis, they reduce transepidermal water loss and help maintain hydration. Thus, these ingredients nourish the skin while simultaneously contributing to the protection of its barrier function.

For which skin types?

Occlusive compounds are suitable for formulating targeted skincare products for:

Very dry skin with a natural lipid deficiency and impaired barrier function.
The winter period: cold, wind and dry air (especially related to heating) weaken the skin barrier, accentuating dehydration.
Localized areas, such as the hands, lips and elbows, are naturally more vulnerable because they produce little sebum (lips) or are subject to repeated friction (hands, elbows).

Applying a treatment containing occlusive agents helps to form a temporary protective barrier on the surface of the skin, thus maintaining skin hydration and comfort.
And dry skin types appreciate them for that reason!

To learn how to recognize dry skin, see our full article .

Hands and lips are sensitive areas. To learn how to care for them daily, see our dedicated article.

TOPICREM's hydration expertise

At TOPICREM , we know that skin hydration does not rely on a single ingredient, but on a balanced synergy between humectants, emollients and occlusive agents.

Our formulas are designed to combine these different moisturizing active ingredients in a way that is adapted to each skin's needs:

Humectants, to help capture and retain water in the stratum corneum.
Emollients, to strengthen the skin barrier and restore suppleness and softness.
Occlusive agents, to limit insensible water loss and protect the skin from external aggressions.

This comprehensive approach provides effective solutions for dehydrated , dry or atopic-prone skin, as well as for localized fragile areas such as hands, lips or elbows.

Because comfortable, supple and balanced skin contributes to daily well-being, our products are formulated with high standards, tolerance and generosity for the whole family.

All TOPICREM formulas have been designed to provide protective hydration and preserve the skin barrier of sensitive skin for the whole family.

To achieve this, the laboratory relies on its expertise derived from pharmaceutical excellence:

Selection of highly tolerable ingredients with proven efficacy,
Development of clinically tested formulas for sensitive skin,
Effectiveness proven by science and approved by consumers.

Through the comfort and emotional well-being they provide, our treatments help you feel confident with your skin and with yourself, to reveal yourself more fully to others, and thus to fully enjoy every moment of life.

What is the difference between a humectant, an emollient, and an occlusive?

A humectant attracts and retains water in the stratum corneum. An emollient provides lipids to strengthen the skin barrier. An occlusive agent forms a protective film that limits water evaporation. Their actions are complementary.

Which active ingredient should I choose to hydrate dry skin?

Dry skin needs emollients to compensate for the lipid deficiency and occlusives to limit the loss

Are occlusive agents bad for the skin?

No. Occlusive agents form a temporary protective barrier that reduces transepidermal water loss. In dermocosmetics, they are highly purified and suitable for sensitive or fragile skin.

Why does my skin remain dry despite using moisturizer?

If the formula contains only humectants, water can evaporate if the skin barrier is compromised. Effective hydration combines humectants, emollients, and occlusives.

What is the difference between dry skin and dehydrated skin?

Dry skin lacks lipids and requires nourishing emollients. Dehydrated skin lacks water and benefits primarily from humectants, combined with protective agents.

Bibliographical references:

¹Verdier-Sévrain S, Bonté F. Skin hydration: a review on its molecular mechanisms. J Cosmet Dermatol. 2007 Jun;6(2):75-82. doi: 10.1111/j.1473-2165.2007.00300.x. PMID: 17524122.

²Lee SH, Jeong SK, Ahn SK. An update of the defensive barrier function of skin. Yonsei Med J. 2006 Jun 30;47(3):293-306. doi: 10.3349/ymj.2006.47.3.293. PMID: 16807977; PMCID: PMC2688147.

³Crowther JM. Understanding humectant behavior through their water-holding properties. Int J Cosmet Sci. 2021 Oct;43(5):601-609. doi:10.1111/ics.12723. Epub 2021 Aug 4. PMID: 34228831.

⁴FEBEA White Paper on Glycerin: https://www.febea.fr/etudes-et-rapports/livre-blanc-glycerine-responsable

⁵Bravo B, Correia P, Gonçalves Junior JE, Sant'Anna B, Kerob D. Benefits of topical hyaluronic acid for skin quality and signs of skin aging: From literature review to clinical evidence. Dermatol Ther. 2022 Dec;35(12):e15903. doi:10.1111/dth.15903. Epub 2022 Oct 21. PMID: 36200921; PMCID: PMC10078143.

⁶Lodén M. Role of topical emollients and moisturizers in the treatment of dry skin barrier disorders. Am J Clin Dermatol. 2003;4(11):771-88. doi:10.2165/00128071-200304110-00005. PMID: 14572299.

⁷Spada F, Barnes TM, Greive KA. Skin hydration is significantly increased by a cream formulated to mimic the skin's own natural moisturizing systems. Clin Cosmet Investig Dermatol. 2018 Oct 15;11:491-497. doi: 10.2147/CCID.S177697. PMID: 30410378; PMCID: PMC6197824.

⁸Effect of humectants and occlusives on sustained elimination of dryness. Journal of the American Academy of Dermatology. Volume 72, Issue 5, Supplement 1. 2015. Page AB74. ISSN 0190-9622. https://doi.org/10.1016/j.jaad.2015.02.305.