Dry Skin & TEWL: How Hyaluronic Acid Restores Hydration
- Marcelline Goyen
- Mar 24
- 6 min read
Updated: Mar 27
Dry skin is a common concern that affects millions worldwide, often leading to discomfort, irritation, and a dull complexion. One key factor behind dry skin is the loss of moisture through the skin barrier, scientifically known as transepidermal water loss (TEWL). Hyaluronic acid, a natural molecule celebrated for its hydrating properties, plays a crucial role in managing dry skin and reducing TEWL. This article explores the relationship between dry skin, hyaluronic acid, and TEWL, offering practical insights to help you achieve healthier, more radiant skin.
Table of Contents
Understanding Dry Skin and TEWL
Dry skin occurs when the skin loses more water than it retains, leading to a compromised skin barrier. This barrier normally protects against environmental damage and prevents excessive water loss. When the barrier weakens, transepidermal water loss (TEWL) increases, causing the skin to feel tight, flaky, and sometimes itchy.
TEWL is the process where water passes from the deeper layers of the skin through the epidermis and evaporates into the atmosphere. Everyone experiences some level of TEWL, but factors such as weaker tight junctions (TJs) between the skin cells, a disturbed skin pH, cold weather, low humidity, harsh skincare products, and aging can increase this loss, worsening dry skin. Therefore, with higher moisture loss, the skin's TEWL increases.
Key points about TEWL and dry skin:
TEWL is a natural process but can be accelerated by external and internal factors.
Increased TEWL leads to dehydration of the skin’s outer layer (stratum corneum).
A damaged skin barrier cannot retain moisture effectively, causing dryness and irritation.
Understanding TEWL helps in choosing skincare ingredients that strengthen the skin barrier and lock in moisture. In my skin-gut axis books you can read about the skin parameters like the TEWL, Hyaluronic acid, skin pH, and sebum.
What Is Hyaluronic Acid and How Does It Work?
Hyaluronic acid (HA) is a naturally occurring molecule found in the skin, connective tissues, and eyes. It is known for its remarkable ability to hold water—up to 1,000 times its weight—making it a powerful hydrating agent.
In the skin, HA attracts and binds water molecules, helping to maintain moisture levels and skin elasticity. It also supports the skin’s repair processes and contributes to a plump, youthful appearance.
How hyaluronic acid benefits the skin:
Hydration: HA draws moisture from the environment and deeper skin layers to the surface.
Barrier support: It helps reinforce the skin’s natural barrier, reducing TEWL.
Soothing: HA calms irritated skin and reduces redness.
Compatibility: Suitable for all skin types, including sensitive and acne-prone skin.
Because of these properties, hyaluronic acid is a staple ingredient in many moisturizers, serums, and treatments aimed at combating dry skin.
The Connection Between Dry Skin, Hyaluronic Acid, and TEWL
Dry skin, hyaluronic acid, and TEWL are closely linked through the skin’s ability to retain moisture. When TEWL increases, the skin loses hydration faster than it can replenish, leading to dryness and discomfort.
Hyaluronic acid helps by:
Reducing TEWL: By strengthening the skin barrier, HA minimizes water loss.
Increasing hydration: HA attracts water molecules, replenishing moisture in the skin’s outer layers.
Improving skin texture: Well-hydrated skin appears smoother, softer, and more radiant.
Research shows that topical application of hyaluronic acid can significantly improve skin hydration and reduce TEWL, especially in dry or aging skin. For example, a study published in the Journal of Clinical and Aesthetic Dermatology found that HA-containing products improved skin moisture retention and barrier function after just a few weeks of use.
This makes hyaluronic acid an essential ingredient for anyone struggling with dry skin and high TEWL.
How to Use Hyaluronic Acid to Combat Dry Skin and TEWL
To maximize the benefits of hyaluronic acid for dry skin and TEWL, consider the following tips:
1. Choose the Right Hyaluronic Acid Product
Look for serums or moisturizers containing low molecular weight HA, which penetrates deeper into the skin for better hydration.
Products combining HA with ceramides or fatty acids can further support the skin barrier.
Avoid formulations with alcohol or harsh fragrances that can irritate dry skin.
2. Apply on Damp Skin
Hyaluronic acid works best when applied to slightly damp skin because it pulls moisture from the surface. After cleansing, gently pat your face with a towel, leaving it moist before applying HA serum or moisturizer.
3. Layer with a Moisturizer
Seal in the hydration by following HA application with a moisturizer that contains occlusive ingredients like petrolatum, shea butter, or squalane. This prevents moisture from evaporating and reduces TEWL.
4. Use Consistently
Daily use of hyaluronic acid products, especially during dry or cold seasons, helps maintain skin hydration and barrier health over time.
5. Avoid Overuse
While HA is safe, using too much or layering multiple HA products can sometimes cause dryness by pulling moisture from deeper skin layers if the environment is very dry. Balance is key.
Improving your HA and connective tissue through diet
If you want to optimize your hyaluronic acid stores and your own connective tissue through diet, you can do so with, for example, bone broth, leafy greens such as kale, sweet potatoes, soy products, dark chocolate, and almonds.
Additional Tips to Reduce TEWL and Improve Skin Hydration
Besides using hyaluronic acid, several lifestyle and skincare habits can help reduce TEWL and improve dry skin:
Use gentle cleansers: Avoid soaps and cleansers that strip natural oils.
Limit hot water exposure: Hot showers can increase TEWL and dry out skin. Use lukewarm water instead.
Humidify your environment: Adding moisture to indoor air helps prevent skin dehydration.
Protect skin from harsh weather: Use scarves, hats, and sunscreen to shield skin from wind and UV damage.
Stay hydrated: Drinking enough water supports overall skin health. Drink 1.5–2 liters per day (water, tea, coffee without sugar), depending on temperature and activity, among other factors.
Incorporate barrier-repair ingredients: Ceramides, niacinamide, and fatty acids strengthen the skin’s protective layer.
By combining these habits with hyaluronic acid use, you can effectively manage dry skin and TEWL.
Marcelline Goyen BSc Skin Therapy and author in the Netherlands
Frequently Asked Questions (FAQ)
What causes increased transepidermal water loss (TEWL)?
TEWL increases due to factors like dry or cold weather, harsh skincare products, skin barrier damage, aging, and certain skin conditions such as eczema or psoriasis.
Can hyaluronic acid alone fix dry skin?
Hyaluronic acid improves hydration and reduces TEWL but works best when combined with moisturizers and barrier-supporting ingredients for long-lasting effects.
Is hyaluronic acid safe for sensitive skin?
Yes, hyaluronic acid is generally well-tolerated by all skin types, including sensitive and acne-prone skin.
How often should I apply hyaluronic acid?
For dry skin, applying hyaluronic acid once or twice daily—morning and night—is effective. Always follow with a moisturizer to lock in hydration.
Does hyaluronic acid help with aging skin?
Yes, by improving hydration and skin elasticity, hyaluronic acid can reduce the appearance of fine lines and wrinkles.
Summary and Next Steps
Dry skin results from increased transepidermal water loss, which weakens the skin’s moisture barrier. Hyaluronic acid plays a vital role in combating dry skin by attracting and retaining water, supporting the skin barrier, and reducing TEWL. Using hyaluronic acid products correctly—on damp skin and followed by a moisturizer—can significantly improve skin hydration and texture.
To maintain radiant, healthy skin, combine hyaluronic acid with gentle skincare, protective habits, and barrier-repair ingredients. Start incorporating hyaluronic acid into your routine today and experience the difference in your skin’s moisture and resilience.
For more detailed insights on skin hydration and barrier health, explore related articles on skin-gut axis and discover how internal health impacts your skin’s appearance.
Summary:
This comprehensive guide explains how dry skin results from increased transepidermal water loss (TEWL) and how hyaluronic acid helps reduce TEWL by boosting skin hydration and strengthening the skin barrier. Practical tips on using hyaluronic acid and additional skincare advice support healthier, radiant skin.
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