FUNCTION Recommended for the care of oily and acne-prone skin. DIRECTIONS FOR USE The first time you use the serum, remove the foil from the bottom of the container and press the inner button. Shake the container well (for 15 seconds) to mix the retinal with the rest of the ingredients. Remove the cap from the product and press the inner button again to release the serum. Spread an amount equivalent to 5 drops every night all over the face, on clean, dry skin. Massage gently until absorbed. PRECAUTIONS AND WARNINGS Avoid contact with eyes. In case of contact with eyes, rinse with plenty of water. Keep the product out of reach of children. You may experience mild temporary redness, a sensation of warmth, or tingling after the initial applications. If you experience discomfort, space out the applications. If irritation persists, discontinue use and consult your dermatologist. While using this product, it is recommended to use facial sunscreen during the day and avoid exposure to direct sunlight.