Obagi Medical Retinol 1.0, new, sealed, and in box. 1oz size. Retinol 1.0 is a highly effective slow-release entrapped Retinol that potently, yet gently promotes skin turnover to help even skin tone and minimize signs of skin aging such as fine lines and wrinkles. For visibly improved, younger-looking skin with minimal irritation. Helps to resurface skin and reduce the appearance of fine lines and wrinkles Effective with minimal irritation