Round Lab | Birch Juice Mild Up UVLock SPF 50

What It Is:
A moisturizing mineral sunscreen with broad-spectrum SPF 50+ that reflects UV rays at the skin's surface for gentle, sensitive skin-friendly protection. Infused with birch sap and water lily extract, it delivers lightweight hydration with a makeup-friendly finish and no white cast. Reef-safe, fragrance-free, non-comedogenic, free of 19 harsh ingredients, and German Dermatest Certified, it checks every box for today's most sought-after K-beauty sunscreen.

How to Use:
Apply liberally and evenly 15 minutes before sun exposure.

Editor Feedback:
"This is the sunscreen I recommend to anyone who says they hate sunscreen. It's a mineral formula that actually behaves like a lightweight moisturizer, no white cast, no greasy finish, and the birch sap keeps it from feeling stripping, which matters if you're using SPF daily.” —Amaya Garcia, assistant editor

Key Ingredients:
Glyceryl glucoside helps boost the skin's natural antioxidant defenses, improving resilience against environmental stressors while reducing moisture loss. Hyaluronic acid delivers lasting hydration for skin that looks plumper and smoother.

Expert Insight:
“We aimed to develop a mineral sunscreen that provides reliable broad-spectrum protection while maintaining a comfortable, lightweight feel on the skin. Formulated with non-nano zinc oxide, it helps protect against UVA and UVB rays and is developed without oxybenzone and octinoxate. Enriched with birch sap along with hydrating ingredients like glyceryl glucoside and hyaluronic acid, the formula helps support skin hydration and improve moisture retention — leaving skin smoother, plumper-looking, and comfortable for everyday use, even for sensitive skin.” —Koo Chul Kwon, director, r&d division, Round Lab