Sometimes your skin doesn't need another active — it just needs a serious drink of water. The Anua Birch 70 Moisture Boosting Serum is a pure hydration serum built around 70% Japanese White Birch Water, a lightweight botanical liquid that penetrates quickly to replenish moisture at multiple layers of the skin and lock it in without any heaviness.

Birch water has been used in traditional Scandinavian and Korean wellness practices for centuries — it's naturally rich in minerals, amino acids, and antioxidants. In skincare, it functions as a deeply nourishing solvent base that helps other ingredients absorb more effectively while maintaining the skin's natural pH balance — something regular tap water cannot do.

Layered on top of that birch base is a precision hydration system: 10 different molecular weights of hyaluronic acid that penetrate different skin depths simultaneously (from surface plumping to deep layer hydration), Panthenol (Pro-Vitamin B5) for barrier repair and anti-inflammatory support, and Anua's ABC Complex (Allantoin, Betaine, and Cucumber Extract) to calm sensitivity and maintain the oil-moisture balance.

The texture is water-thin and absorbs in seconds. Can be layered 2–3 times for an extra hydration hit when skin is particularly dry or stressed.

Sul Skin note: A great serum to reach for when your skin feels depleted — after travel, season changes, or while using stronger actives like retinol or acids.