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Déshydratation cutanée

How is skin dehydration manifested?

Skin hydration lies at the heart of cutaneous functions, particularly the barrier function of the stratum corneum. This barrier, when well-maintained, impedes the penetration of irritating substances and pathogens such as bacteria. Here are 5 factors to be aware of in order to prevent your skin from becoming dehydrated.

How does the skin store water?

The skin (hypodermis, dermis, epidermis) contains 30% of our body's water and is itself composed of an average of 70% water. The dermis holds 80% water. It is stored in the form of a gel thanks to hyaluronic acid. At the dermis-epidermis junction, this concentration rises to 70%. In the horny layer and the upper layer of the epidermis, it is 10%.

Why does skin become dehydrated?

Insensible Water Loss (IWL) refers to a passive phenomenon of water evaporation contained within the skin. The water, originating from the bloodstream, traverses the various layers of the skin and evaporates at its surface. Under normal functioning, this loss amounts to 300 - 400 mL per day across the entire body. The greater the water loss, the more dehydrated the skin becomes. This I.W.L., and therefore skin hydration, is influenced by various factors, over which we may not necessarily have control:

  • The state of the hydrolipidic film: When functioning properly, the skin's hydrolipidic film forms a layer that limits the evaporation of water. If it is damaged, for instance due to a lack of lipids on the skin's surface, water evaporates more easily. Therefore, dry skin is often dehydrated. However, dehydrated skin is not necessarily dry.

  • The quantity of Natural Moisturising Factors (NMF) in the epidermis: NMFs are a complex blend of hygroscopic substances present in the stratum corneum of the epidermis, which have a strong water retention capacity. They are composed of amino acids, urea, carbohydrates, lactic acid, and mineral ions (chloride, sodium, potassium). They enable the binding of water molecules at the level of the epidermis and thus ensure the hydration of the stratum corneum. Their reduction, therefore, facilitates skin dehydration.

  • The quantity of hyaluronic acid in the dermis: This macromolecule captures large amounts of water. However, over the years, its concentration decreases, which impairs the deep hydration of the skin.

  • The integrity of the skin barrier: The proper cohesion between the cells of the stratum corneum, thanks to the intercellular cement, also prevents excessive dehydration. This cement consists of three main ingredients: fatty acids, cholesterol, and ceramides. This cement slows down the diffusion of water from the deeper layers of the dermis, thus contributing to the maintenance of skin hydration. Therefore, when the stratum corneum is damaged (burns, friction, micro-cuts, cracks, fissures, etc.), water escapes more easily, leaving the skin dehydrated.

What treatments should be used for dehydrated skin?

Morning and evening, opt for a gentle cleanser and super-fatted like our hydrating wash care with palmarosa. You can then use the hydrating toner, which will rebalance the skin's pH, while eliminating the limestone residues present on the face. Concentrated in hyaluronic acid and aloe vera, this lotion helps to rehydrate the skin and reduce feelings of tightness. It is only after these initial steps have been carried out that targeted anti-dehydration treatments can be applied.

Hyaluronic acid is the key compound for hydrating your skin. This active ingredient acts like a molecular sponge: it is capable of binding up to 1,000 times its weight in water. Morning and evening, on clean and dry skin, apply the hydrating serum based on hyaluronic acid and provitamin B5. If you have dry skin, then use the hydrating face cream with 9 ingredients. Combination to oily skin types will prefer the purifying face cream with zinc PCA and bamboo extract.

Throughout the day, the botanical hydrating mist is a portable treatment that provides an immediate refreshing boost. The skin feels comfortable and the complexion is radiant. It contains centifolia rose cells and a hydrating biosaccharide, soothing verbena hydrosol, and rebalancing inulin.

Note : The UV rays from the sun contribute to skin dehydration. Therefore, in the morning, conclude your skincare routine by applying a broad-spectrum sun protection such as the sun cream face SPF30 with aloe vera. Its light texture, without leaving white marks, provides a non-shiny and non-sticky finish. Moreover, this cream is enriched with hyaluronic acid and aloe vera to deeply hydrate the skin.

Source:

  • BONTE F. & al. Skin hydration: a review on its molecular mechanisms. Journal of Cosmetic Dermatology (2007).

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