Most high-performance skincare makes you choose:
Clinical Skincare
Results, but irritation, redness, downtime
Gentle Skincare
Comfortable, but slow, minimal results
Until now, you had to choose.
Each formula delivers treatment-level results without irritation.
Treatment-level skincare that feels as good as it performs.
Powerful actives that treat skin concerns
Soothing ingredients that protect the skin
Deau is built on a simple principle to treat and protect at the same time.
At DEAU, we don't choose between results and care. We engineer both. Skin is treated and protected simultaneously for long-term skin health.
Rather than relying on single “Hero Ingredients”, each active is selected for how it contributes to targeted correction, skin stability, and daily tolerance.
Ushio Onsen Water is sourced from Izumo, Shimane Prefecture—which is nicknamed "the prefecture of beautiful skin."
For over 1,300 years, people have traveled to these waters to heal—muscles, joints, skin conditions. In Japan, doctors still prescribe onsen visits for recovery. The same waters that once healed samurai after battle now help your skin recover from the stress of everyday life.
THE FIRST WRITTEN RECORD, 733
— Izumo no Kuni Fudoki (Chronicle of the Land of Izumo)
This isn't "just water." Ushio Onsen water is naturally rich in minerals that:
Create the right environment for actives to penetrate effectively
Calm reactive pathways so powerful ingredients can work without triggering irritation
Support barrier health with calcium, magnesium, and silica
Change of Transepidermal Water Loss (TEWL)
Lower = Better Barrier Recovery
Ushio Onsen Water restored barrier function 19% faster than purified water.
TEWL score: Ushio 87 vs. Purified 104 at Day 12.
Change of Skin Moisture Level
Higher = Better Moisture Retention
Ushio-treated skin retained 12% more moisture than purified water over 12 days.
Score: Ushio 122 vs. Purified 109.
Skin Moisture Level Over Time
Higher = Better Water Retention
Ushio gel showed 30% higher peak moisture vs. purified water gel.
Skin texture visibly refined at 2 hours.
This is skincare built differently — treatment and protection engineered together, not balanced after the fact. Clinical results without compromising long-term skin health.
Because skincare should work for your skin, not against it.
EXPLORE THE ESSENTIAL PIECES
