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Everything you need to know about TEWL and how to treat it

You may have heard of TEWL and wondered what it is and if it's something you need to know about if you have stressed, sensitive skin. Here we delve into everything you need to know about TEWL and how to prevent it. 

By Sarah Maven Daily Moisturiser

What is TEWL?

Starting with the fundamentals, Trans Epidermal Water Loss (TEWL) is the process by which water exits the body through the epidermis, which constitutes the uppermost layer of the skin. TEWL is a naturally regulated physiological mechanism through which the body continuously releases water.

What's the importance of TEWL?

TEWL is significant for both skin and body health. Water is a fundamental constituent, accounting for approximately 60% of the human body. It plays a pivotal role in various vital functions, including temperature regulation, waste elimination, and joint lubrication. Consequently, maintaining an optimal balance of TEWL is crucial for overall skin and bodily well-being.

What are the causes of TEWL?

Several factors can contribute to elevated TEWL levels. Environmental conditions, such as extreme cold or hot weather, can induce skin dryness. Additionally, skincare products containing ingredients like Sodium Lauryl Sulfate (SLS) that disrupt the skin's delicate equilibrium may exacerbate TEWL. Furthermore, damage to the skin barrier, often experienced in conditions like eczema, can result in increased TEWL. The signs of heightened TEWL are readily noticeable, including dryness, skin tightness, rough texture, and flakiness. Increased visible lines on the skin may also manifest as a consequence of elevated TEWL.

For preventing and reducing TEWL, discover our three top tips to support your skin health.

By Sarah Maven Daily Moisturiser

1. Choose skin-friendly products

To mitigate and minimize TEWL, it is advisable to avoid products that may sensitize or irritate the skin. Avoiding known irritants, like essential oils and fragrance. You may even find it helpful to patch test a new skincare products in a small, inconspicuous area before widespread use. You can take comfort at By Sarah that our whole range has been Dermatologically Tested and is suitable for sensitive skin.

2. Maintain a strong skin barrier

Maintaining a strong and healthy skin barrier is pivotal for reducing TEWL and ensuring skin health. Opting for simple skincare routines featuring proven, hydrating actives and nourishing antioxidants is best. Gentle, non-stripping cream-based cleansers, like our Balancer Cream Cleanser, and hydrating products, like our Reviver Hydrating Mist, can be particularly effective. Additionally, the use of our Maven Daily Moisturiser that is clinically proven to reduce TEWL for up to 4 hours after first use.

3. Soothing skincare products

Ceramide-based skincare products can serve as a potent means of supporting the skin barrier. Ceramides, which are naturally present in the skin, contribute to the cohesion of skin cells, enhancing their strength. Using skincare formulations containing ceramides can be beneficial in preserving moisture and promoting skin barrier integrity. Take our Balancer Cream Cleanser, formulated with Niacinamide which helps to increase fatty acid ceramide levels in your skin, making it a perfect choice for eczema and rosacea prone skin.

The takeaway? Maintaining an appropriate balance of TEWL is integral to healthy skin and overall well-being. Carefully selecting skincare products, prioritizing skin barrier health, and incorporating ceramide-based products can be effective strategies in preventing and reducing TEWL. 


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