Hyalu-Cica Blue Serum is SKIN1004's lightweight, watery gel serum built around Madagascar Centella Asiatica leaf water combined with five types of hyaluronic acid for deep, long-lasting hydration. Niacinamide and panthenol help soothe and calm skin while supporting the moisture barrier, and the serum's signature blue tint comes naturally from gardenia extract rather than added dye. It absorbs quickly without stickiness, making it suitable for oily, combination, and sensitive skin types that want lightweight hydration without heaviness. Best applied after cleansing and toning, patted gently into the skin morning and night before moisturizer. A good pick for anyone chasing the glassy, dewy Korean skincare finish while calming redness or irritation.