Description: Perfect for problematic and photo-damaged skin, Retinol 1.0 contains 1% pure retinol, the highest concentration currently available, and should be used for advanced treatment of pre-conditioned skin. The retinol products help stimulate cell regeneration and build collagen to diminish the appearance of fine lines, wrinkles, and age spots from both photo- and intrinsic- aging. Additionally, they help minimize the appearance of pore size, while correcting blemishes and blotchiness often associated with problematic skin. How to use: Begin by limiting use to twice a week, then gradually increase frequency to every other night, and finally once an eveningas tolerated. Apply a pea-sized amount of Retinol 1.0 to thoroughly cleansed skin in the evening. Carefully avoid the eyes and the corner of the eyes. To ensure optimal results, wait at least 30 minutes before applying any corrective or moisturizing products the same evening as applying Skinceuticals retinol.