Hydration is often discussed in terms of adding moisture to the skin, but maintaining hydration is just as important. Transepidermal Water Loss (TEWL) refers to the gradual evaporation of water from the skin’s surface, a process that, when accelerated, can compromise barrier health, texture, and comfort.
What Is Transepidermal Water Loss (TEWL)?
Transepidermal Water Loss is the passive movement of water from the deeper layers of the skin through the epidermis and into the surrounding air. This process is natural and ongoing, but when the skin barrier is weakened, TEWL increases.
Elevated TEWL leaves skin more vulnerable to:
-
Dehydration
-
Sensitivity and irritation
-
Rough texture and dullness
-
Reduced elasticity over time
In healthy skin, the barrier regulates this process efficiently. When compromised, water loss exceeds retention.
What Causes Increased TEWL?
Several factors can disrupt the skin barrier and accelerate water loss:
-
Over-exfoliation or aggressive actives
-
Environmental stressors such as cold, wind, or pollution
-
Ageing, which naturally weakens lipid structure
-
Harsh cleansers that strip protective oils
When the barrier is compromised, skin loses water faster than it can replenish it, leading to chronic dehydration even in well-moisturised routines.
How to Reduce Transepidermal Water Loss
Reducing TEWL is less about adding more water and more about strengthening the skin’s ability to retain it.
Effective strategies include:
-
Using gentle cleansers that respect the lipid barrier
-
Applying humectants such as Sodium Hyaluronate to bind water
-
Reinforcing the barrier with emollients and ceramides
-
Sealing hydration with appropriate occlusives
-
Supporting barrier repair with niacinamide and peptides
Balanced routines focused on barrier health deliver more sustainable hydration than intensive, short-term treatments.
The SHYGOL Approach to TEWL
At SHYGOL, hydration is always paired with barrier support. Our formulations are designed to reduce TEWL by strengthening the skin’s structure and resilience, rather than overwhelming it with excess moisture.
This approach prioritises long-term comfort, texture, and skin health.
Final Thoughts
Healthy hydration depends on retention, not saturation. By reducing TEWL and supporting the skin barrier, skin remains plump, resilient, and comfortable. This is the foundation of long-term skin health.
