Dot & Key Bluberry Hydrate Barrier Boost Face Serum (often called a 12% Barrier Boost Serum) is a high-performance face serum formulated with a blend of hyaluronic acid and ceramides, plus other supportive ingredients like niacinamide and plant bio-actives. It’s designed to repair and fortify the skin’s moisture barrier, deliver deep hydration, and promote a healthier, more resilient complexion.