If your skin feels tight, dehydrated, irritated, or uncomfortable despite using skincare products, excessive transepidermal water loss (TEWL) may be part of the reason.
TEWL refers to the water that naturally evaporates from the skin into the environment. Some water loss is normal. Problems arise when the skin barrier becomes compromised and water escapes faster than the skin can replenish it.
What Causes Increased TEWL?
One of the most common causes of excessive TEWL is a weakened skin barrier. When the skin barrier is compromised, moisture escapes more easily, contributing to dehydration, sensitivity, and irritation. To better understand how the skin barrier functions, read our guide to understanding the skin barrier.
Factors that can contribute include:
• Over-exfoliation
• Harsh cleansers
• Excessive use of active ingredients
• Sun exposure
• Dry climates and low humidity
• Inadequate moisturization
• Aging and declining lipid production
Many people focus exclusively on hydration while overlooking moisturization. Without ingredients that help reduce moisture loss, hydrated skin can still become dehydrated over time.
Signs Your Skin May Be Experiencing Excessive TEWL
While TEWL requires specialized equipment to measure, the signs are often easy to recognize.
Common symptoms include:
• Tightness after cleansing
• Persistent dehydration
• Increased sensitivity
• Flaking or rough texture
• Stinging when products are applied
• Difficulty tolerating active ingredients
• Skin that looks dull despite using hydrating products
Many people assume they have dry skin when they are actually experiencing excessive water loss.
How to Reduce TEWL
Reducing TEWL is not about adding more products. It is about supporting the skin barrier with the right products and ingredients.
Choose gentle cleansers that do not leave skin feeling stripped. Avoid excessive exfoliation and aggressive skincare routines. Focus on hydration, moisturization, and ingredients that help reinforce the skin barrier.
Healthy skin often comes from supporting the skin barrier with the right ingredients rather than constantly adding more products.
Products That Help Support the Skin Barrier
Hydrating Toner: More Than a Toner
Toners have become staples in many skincare routines, but for years the category was dominated by formulas that stripped the skin and increased dehydration.
Our Hydrating Toner takes a different approach.
Formulated with humectants, moisturizing ingredients, and barrier-supporting lipids, our Hydrating Toner functions more like a serum-toner hybrid than a traditional toner. The formula helps replenish hydration while supporting the skin's natural ability to retain moisture, making it particularly beneficial for dehydrated skin experiencing excessive TEWL.
Clients dealing with dehydration, tightness, and visible signs of moisture loss often find that it quickly becomes one of the most important steps in their routine.
Herbal Hydrating Gel Mask: Intensive Hydration Support
When skin feels dehydrated, stressed, or overworked, hydration alone is often not enough.
The Herbal Hydrating Gel Mask combines aloe vera, hyaluronic acid, niacinamide, and soothing botanical extracts to help replenish moisture and calm the appearance of stressed skin.
Many clients reach for it after travel, seasonal weather changes, sun exposure, or periods of over-exfoliation.
Onerta® Cream Barrier: Helping Reduce Moisture Loss
Hydration is only part of the equation. The skin also needs support to help keep moisture where it belongs.
Onerta® Cream Barrier was developed to help strengthen the skin barrier while improving moisture retention. Aquaxyl™, Citystem™, peptides, and nourishing emollients help support healthier-looking skin and reduce the appearance of dehydration associated with excessive TEWL.
For dry, sensitive, or compromised skin, it is often the final step that helps lock hydration in.
FAQ
What does TEWL stand for?
TEWL stands for transepidermal water loss, the natural movement of water from the skin into the surrounding environment.
Can TEWL be prevented?
No. Some water loss is a normal biological process. The goal is not to eliminate TEWL, but to maintain a healthy skin barrier that keeps water loss within a normal range.
Does dehydrated skin always mean dry skin?
No. Dehydrated skin lacks water, while dry skin lacks oil. Even oily and acne-prone skin can experience excessive TEWL and become dehydrated.
Final Thoughts
TEWL may sound technical, but it plays a major role in how your skin looks and feels. When the skin barrier is healthy, moisture stays where it belongs, skin feels more comfortable, and active ingredients are generally better tolerated.
Gentle cleansing, proper hydration, and consistent moisturization can help reduce excessive TEWL and improve overall skin health.
