Isdin Isdinceutics Retinal Intense 50 ML: Experience visibly younger skin with Retinal Intense, the biphasic night serum that helps accelerate skin renewal. Formulated with retinaldehyde, it visibly reduces fine lines and wrinkles for smoother, more even, and younger-looking skin. Key Components Pentylene Glycol Rosemary Leaf Extract Citric Acid Indication Anti-wrinkle action Smooth and silky finish How to use Use Retinal Intense in your night routine. Dispense two pumps of product and mix both phases until a uniform color is obtained. Apply a thin layer onto clean, dry skin, avoiding sensitive areas such as the eye contour, nose, and mouth.