What Is Transepidermal Water Loss And How To Prevent It

2025-04-17

What Is Transepidermal Water Loss And How To Prevent It.


Hydration Image

What Is Transepidermal Water Loss (TEWL)?


TEWL stands for Trans Epidermal Water Loss. It refers to the natural process by which water is lost from the skin's surface through evaporation. This occurs as a result of the skin's outermost layer, known as the stratum corneum, which is composed of dead skin cells and lipids. These lipids help to create a barrier on the skin's surface, preventing water loss and protecting the skin from external factors such as pollutants, UV radiation, and microorganisms.


Transepidermal Water Loss Diagram
Transepidermal Water Loss - Intact Skin Barrier compared to Broken Skin Barrier.

What Is Transepidermal Water Loss (TEWL)?


  • Harsh skincare products: The use of harsh chemicals and skincare products can strip the skin's natural oils and disrupt the skin's barrier, leading to increased TEWL.
  • Hot showers and baths: Hot water can strip the skin of its natural oils, leading to increased TEWL and dryness.
  • Environmental factors: Exposure to dry air, low humidity, and harsh weather conditions can increase TEWL and cause dehydration of the skin.
  • Age: As we age, the skin's natural barrier becomes less effective, leading to increased TEWL and dryness.
  • Skin conditions: Certain skin conditions such as eczema and psoriasis can disrupt the skin's barrier and increase TEWL.

    • How To Stop Transepidermal Water Loss?


    To prevent excessive TEWL, it's essential to maintain healthy skin through proper skincare routines.


    One of the most important steps in a skincare routine to prevent TEWL is moisturising. Using a moisturiser that contains hydrating ingredients such as hyaluronic acid, glycerin, or ceramides can help to lock in moisture and prevent water loss from the skin's surface. Moisturisers can come in various forms, including creams, lotions, and oils, and can be used both in the morning and at night to help maintain hydration levels.


    Another important step in preventing TEWL is to use a gentle, pH-balanced cleanser. Harsh cleansers can strip the skin of its natural oils, leading to dryness and increased TEWL. Using a gentle, non-stripping cleanser can help to remove impurities from the skin while still maintaining the skin's natural moisture.


    In addition to moisturising and cleansing, using a hydrating serum or face mist can also help to maintain hydration levels and prevent TEWL. Serums and mists contain lightweight, hydrating ingredients that can penetrate the skin's surface to provide deep hydration.


    Finally, protecting the skin from environmental factors such as sun damage and harsh weather conditions is also essential to prevent TEWL. Using a broad-spectrum sunscreen with an SPF of 30 or higher can help to shield the skin from harmful UV rays, while wearing protective clothing such as hats and long sleeves can also help to prevent water loss from the skin's surface.


    In summary, incorporating a hydrating skincare routine that includes moisturising, gentle cleansing, hydrating serums or mists, and sun protection can help to prevent trans epidermal water loss and maintain healthy, hydrated skin. By using the right products and protecting the skin from environmental factors, it's possible to maintain a healthy skin barrier and prevent dryness and dehydration.